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From bridg...@apache.org
Subject [2/5] drill-site git commit: add throttling doc to site for drill 1.12
Date Tue, 14 Nov 2017 21:33:03 GMT
http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/storage-plugin-configuration/index.html
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diff --git a/docs/storage-plugin-configuration/index.html b/docs/storage-plugin-configuration/index.html
index a16e1a8..828ec9d 100644
--- a/docs/storage-plugin-configuration/index.html
+++ b/docs/storage-plugin-configuration/index.html
@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
             </ul>

http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/storage-plugin-registration/index.html
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diff --git a/docs/storage-plugin-registration/index.html b/docs/storage-plugin-registration/index.html
index 18fe217..52ac949 100644
--- a/docs/storage-plugin-registration/index.html
+++ b/docs/storage-plugin-registration/index.html
@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
             </ul>

http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/string-manipulation/index.html
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diff --git a/docs/string-manipulation/index.html b/docs/string-manipulation/index.html
index 6b275b7..63203f5 100644
--- a/docs/string-manipulation/index.html
+++ b/docs/string-manipulation/index.html
@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
             </ul>

http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/summary/index.html
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diff --git a/docs/summary/index.html b/docs/summary/index.html
index 0f21652..3412944 100644
--- a/docs/summary/index.html
+++ b/docs/summary/index.html
@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
             </ul>

http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/supported-data-types/index.html
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diff --git a/docs/supported-data-types/index.html b/docs/supported-data-types/index.html
index a260d06..e53751f 100644
--- a/docs/supported-data-types/index.html
+++ b/docs/supported-data-types/index.html
@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
             </ul>

http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/supported-sql-commands/index.html
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diff --git a/docs/supported-sql-commands/index.html b/docs/supported-sql-commands/index.html
index 9397dec..621f05f 100644
--- a/docs/supported-sql-commands/index.html
+++ b/docs/supported-sql-commands/index.html
@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
             </ul>

http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/tableau-examples/index.html
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diff --git a/docs/tableau-examples/index.html b/docs/tableau-examples/index.html
index 62b3940..034c03e 100644
--- a/docs/tableau-examples/index.html
+++ b/docs/tableau-examples/index.html
@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
             </ul>

http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/testing-the-odbc-connection/index.html
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diff --git a/docs/testing-the-odbc-connection/index.html b/docs/testing-the-odbc-connection/index.html
index d44d8ab..2eebfa9 100644
--- a/docs/testing-the-odbc-connection/index.html
+++ b/docs/testing-the-odbc-connection/index.html
@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
             </ul>

http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/text-files-csv-tsv-psv/index.html
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diff --git a/docs/text-files-csv-tsv-psv/index.html b/docs/text-files-csv-tsv-psv/index.html
index aa6db65..b128e0c 100644
--- a/docs/text-files-csv-tsv-psv/index.html
+++ b/docs/text-files-csv-tsv-psv/index.html
@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
             </ul>

http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/throttling/index.html
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diff --git a/docs/throttling/index.html b/docs/throttling/index.html
new file mode 100644
index 0000000..d993547
--- /dev/null
+++ b/docs/throttling/index.html
@@ -0,0 +1,1250 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+
+<meta charset="UTF-8">
+<meta name=viewport content="width=device-width, initial-scale=1">
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+<link href="//maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css" rel="stylesheet" type="text/css"/>
+<link href='//fonts.googleapis.com/css?family=PT+Sans' rel='stylesheet' type='text/css'/>
+<link href="/css/site.css" rel="stylesheet" type="text/css"/>
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+            
+          
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+              <li class="toctree-l2"><a class="reference internal" href="/docs/analyzing-the-yelp-academic-dataset/">Analyzing the Yelp Academic Dataset</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Learn Drill with the MapR Sandbox</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/about-the-mapr-sandbox/">About the MapR Sandbox</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/installing-the-apache-drill-sandbox/">Installing the Apache Drill Sandbox</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/getting-to-know-the-drill-sandbox/">Getting to Know the Drill Sandbox</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/lesson-1-learn-about-the-data-set/">Lesson 1: Learn about the Data Set</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/lesson-2-run-queries-with-ansi-sql/">Lesson 2: Run Queries with ANSI SQL</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/lesson-3-run-queries-on-complex-data-types/">Lesson 3: Run Queries on Complex Data Types</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/summary/">Summary</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/analyzing-highly-dynamic-datasets/">Analyzing Highly Dynamic Datasets</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/analyzing-social-media/">Analyzing Social Media</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/analyzing-data-using-window-functions/">Analyzing Data Using Window Functions</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Install Drill</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/install-drill-introduction/">Install Drill Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/migrating-parquet-data/">Migrating Parquet Data</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Installing Drill in Embedded Mode</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/embedded-mode-prerequisites/">Embedded Mode Prerequisites</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/installing-drill-on-linux-and-mac-os-x/">Installing Drill on Linux and Mac OS X</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/starting-drill-on-linux-and-mac-os-x/">Starting Drill on Linux and Mac OS X</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/installing-drill-on-windows/">Installing Drill on Windows</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/starting-drill-on-windows/">Starting Drill on Windows</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Installing Drill in Distributed Mode</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/distributed-mode-prerequisites/">Distributed Mode Prerequisites</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/installing-drill-on-the-cluster/">Installing Drill on the Cluster</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/starting-drill-in-distributed-mode/">Starting Drill in Distributed Mode</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/starting-the-web-console/">Starting the Web Console</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/identifying-multiple-drill-versions-in-a-cluster/">Identifying Multiple Drill Versions in a Cluster</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Configure Drill</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/configure-drill-introduction/">Configure Drill Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/configuring-drill-memory/">Configuring Drill Memory</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Securing Drill</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/securing-drill-introduction/">Securing Drill Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/secure-communication-paths/">Secure Communication Paths</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/roles-and-privileges/">Roles and Privileges</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-user-impersonation/">Configuring User Impersonation</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-inbound-impersonation/">Configuring Inbound Impersonation</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-user-impersonation-with-hive-authorization/">Configuring User Impersonation with Hive Authorization</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-user-security/">Configuring User Security</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-plain-security/">Configuring Plain Security</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-kerberos-security/">Configuring Kerberos Security</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-web-console-and-rest-api-security/">Configuring Web Console and REST API Security</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Configuring a Multitenant Cluster</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-a-multitenant-cluster-introduction/">Configuring a Multitenant Cluster Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-multitenant-resources/">Configuring Multitenant Resources</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-resources-for-a-shared-drillbit/">Configuring Resources for a Shared Drillbit</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Configuration Options</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuration-options-introduction/">Configuration Options Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/start-up-options/">Start-Up Options</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/planning-and-execution-options/">Planning and Execution Options</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/persistent-configuration-storage/">Persistent Configuration Storage</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/ports-used-by-drill/">Ports Used by Drill</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/configuring-the-drill-shell/">Configuring the Drill Shell</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Connect a Data Source</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/connect-a-data-source-introduction/">Connect a Data Source Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/storage-plugin-registration/">Storage Plugin Registration</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Storage Plugin Configuration</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/plugin-configuration-basics/">Plugin Configuration Basics</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/workspaces/">Workspaces</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/drill-default-input-format/">Drill Default Input Format</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/file-system-storage-plugin/">File System Storage Plugin</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/hbase-storage-plugin/">HBase Storage Plugin</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/hive-storage-plugin/">Hive Storage Plugin</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/rdbms-storage-plugin/">RDBMS Storage Plugin</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/mongodb-storage-plugin/">MongoDB Storage Plugin</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/mapr-db-format/">MapR-DB Format</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/s3-storage-plugin/">S3 Storage Plugin</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/httpd-storage-plugin/">HTTPD Storage Plugin</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">ODBC/JDBC Interfaces</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/interfaces-introduction/">Interfaces Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/using-the-jdbc-driver/">Using the JDBC Driver</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/using-jdbc-with-squirrel-on-windows/">Using JDBC with SQuirreL on Windows</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Installing the ODBC Driver</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/installing-the-driver-on-linux/">Installing the Driver on Linux</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/installing-the-driver-on-mac-os-x/">Installing the Driver on Mac OS X</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/installing-the-driver-on-windows/">Installing the Driver on Windows</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Configuring ODBC</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/odbc-configuration-reference/">ODBC Configuration Reference</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/logging-and-tracing/">Logging and Tracing</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-odbc-on-linux/">Configuring ODBC on Linux</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-odbc-on-mac-os-x/">Configuring ODBC on Mac OS X</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-odbc-on-windows/">Configuring ODBC on Windows</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/testing-the-odbc-connection/">Testing the ODBC Connection</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Using Drill Explorer</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/drill-explorer-introduction/">Drill Explorer Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/connecting-drill-explorer-to-data/">Connecting Drill Explorer to Data</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/browsing-data-and-defining-views/">Browsing Data and Defining Views</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Using Drill with BI Tools</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/using-drill-with-bi-tools-introduction/">Using Drill with BI Tools Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/tableau-examples/">Tableau Examples</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/using-microstrategy-analytics-with-apache-drill/">Using MicroStrategy Analytics with Apache Drill</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/using-tibco-spotfire-desktop-with-drill/">Using Tibco Spotfire Desktop with Drill</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-tibco-spotfire-server-with-drill/">Configuring Tibco Spotfire Server with Drill</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/using-qlik-sense-with-drill/">Using Qlik Sense with Drill</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/using-apache-drill-with-tableau-10-2/">Using Apache Drill with Tableau 10.2</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/using-apache-drill-with-tableau-9-desktop/">Using Apache Drill with Tableau 9 Desktop</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/using-apache-drill-with-tableau-9-server/">Using Apache Drill with Tableau 9 Server</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/using-information-builders-webfocus-with-apache-drill/">Using Information Builders’ WebFOCUS with Apache Drill</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/configuring-jreport-with-drill/">Configuring JReport with Drill</a></li>
+              
+            </ul>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Query Data</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/query-data-introduction/">Query Data Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Querying a File System</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/querying-a-file-system-introduction/">Querying a File System Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/querying-avro-files/">Querying Avro Files</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/querying-json-files/">Querying JSON Files</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/querying-parquet-files/">Querying Parquet Files</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/querying-plain-text-files/">Querying Plain Text Files</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/querying-directories/">Querying Directories</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/querying-sequence-files/">Querying Sequence Files</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/querying-hbase/">Querying HBase</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Querying Complex Data</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/querying-complex-data-introduction/">Querying Complex Data Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/sample-data-donuts/">Sample Data: Donuts</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/selecting-flat-data/">Selecting Flat Data</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/using-sql-functions-clauses-and-joins/">Using SQL Functions, Clauses, and Joins</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/selecting-nested-data-for-a-column/">Selecting Nested Data for a Column</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/selecting-multiple-columns-within-nested-data/">Selecting Multiple Columns Within Nested Data</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/querying-hive/">Querying Hive</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/querying-the-information-schema/">Querying the INFORMATION SCHEMA</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/querying-system-tables/">Querying System Tables</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/monitoring-and-canceling-queries-in-the-drill-web-console/">Monitoring and Canceling Queries in the Drill Web Console</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1 current_section "><a href="javascript: void(0);">Performance Tuning</a></li>
+          <ul class="current_section">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/performance-tuning-introduction/">Performance Tuning Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Partition Pruning</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/partition-pruning-introduction/">Partition Pruning Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/how-to-partition-data/">How to Partition Data</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/asynchronous-parquet-reader/">Asynchronous Parquet Reader</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/optimizing-parquet-metadata-reading/">Optimizing Parquet Metadata Reading</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/parquet-filter-pushdown/">Parquet Filter Pushdown</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/hive-metadata-caching/">Hive Metadata Caching</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/choosing-a-storage-format/">Choosing a Storage Format</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Query Plans and Tuning</a></li>
+              <ul style="">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/query-plans-and-tuning-introduction/">Query Plans and Tuning Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/join-planning-guidelines/">Join Planning Guidelines</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/guidelines-for-optimizing-aggregation/">Guidelines for Optimizing Aggregation</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/modifying-query-planning-options/">Modifying Query Planning Options</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/sort-based-and-hash-based-memory-constrained-operators/">Sort-Based and Hash-Based Memory-Constrained Operators</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
+              
+                <li class="toctree-l3 current"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Identifying Performance Issues</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/query-plans/">Query Plans</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/query-profiles/">Query Profiles</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Performance Tuning Reference</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/query-profile-column-descriptions/">Query Profile Column Descriptions</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/physical-operators/">Physical Operators</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/monitoring-metrics/">Monitoring Metrics</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Log and Debug</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/log-and-debug-introduction/">Log and Debug Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/error-messages/">Error Messages</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/modify-logback-xml/">Modify logback.xml</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/review-the-java-stack-trace/">Review the Java Stack Trace</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/query-audit-logging/">Query Audit Logging</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">SQL Reference</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/sql-reference-introduction/">SQL Reference Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Data Types</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/supported-data-types/">Supported Data Types</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/date-time-and-timestamp/">Date, Time, and Timestamp</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/handling-different-data-types/">Handling Different Data Types</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/lexical-structure/">Lexical Structure</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/operators/">Operators</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">SQL Functions</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/about-sql-function-examples/">About SQL Function Examples</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/math-and-trig/">Math and Trig</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/data-type-conversion/">Data Type Conversion</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/date-time-functions-and-arithmetic/">Date/Time Functions and Arithmetic</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/string-manipulation/">String Manipulation</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/aggregate-and-aggregate-statistical/">Aggregate and Aggregate Statistical</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/functions-for-handling-nulls/">Functions for Handling Nulls</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">SQL Window Functions</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/sql-window-functions-introduction/">SQL Window Functions Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/aggregate-window-functions/">Aggregate Window Functions</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/ranking-window-functions/">Ranking Window Functions</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/value-window-functions/">Value Window Functions</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/sql-window-functions-examples/">SQL Window Functions Examples</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Nested Data Functions</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/nested-data-limitations/">Nested Data Limitations</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/flatten/">FLATTEN</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/kvgen/">KVGEN</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/repeated-count/">REPEATED_COUNT</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/repeated-contains/">REPEATED_CONTAINS</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/query-directory-functions/">Query Directory Functions</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">SQL Commands</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/supported-sql-commands/">Supported SQL Commands</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/set/">SET</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/reset/">RESET</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/alter-system/">ALTER SYSTEM</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/create-table-as-ctas/">CREATE TABLE AS (CTAS)</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/create-temporary-table-as-cttas/">CREATE TEMPORARY TABLE AS (CTTAS)</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/create-function-using-jar/">CREATE FUNCTION USING JAR</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/partition-by-clause/">PARTITION BY Clause</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/create-view/">CREATE VIEW</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/describe/">DESCRIBE</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/drop-function-using-jar/">DROP FUNCTION USING JAR</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/drop-table/">DROP TABLE</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/drop-view/">DROP VIEW</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/explain/">EXPLAIN</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/select/">SELECT</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/select-list/">SELECT List</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/from-clause/">FROM Clause</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/group-by-clause/">GROUP BY Clause</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/having-clause/">HAVING Clause</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/limit-clause/">LIMIT Clause</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/offset-clause/">OFFSET Clause</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/order-by-clause/">ORDER BY Clause</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/union-set-operator/">UNION Set Operator</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/where-clause/">WHERE Clause</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/with-clause/">WITH Clause</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/show-databases-and-show-schemas/">SHOW DATABASES and SHOW SCHEMAS</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/show-files/">SHOW FILES</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/show-tables/">SHOW TABLES</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/use/">USE</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">SQL Conditional Expressions</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/case/">CASE</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/reserved-keywords/">Reserved Keywords</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/sql-extensions/">SQL Extensions</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Data Sources and File Formats</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/data-sources-and-file-formats-introduction/">Data Sources and File Formats Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/hive-to-drill-data-type-mapping/">Hive-to-Drill Data Type Mapping</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/deploying-and-using-a-hive-udf/">Deploying and Using a Hive UDF</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/parquet-format/">Parquet Format</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/json-data-model/">JSON Data Model</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/text-files-csv-tsv-psv/">Text Files: CSV, TSV, PSV</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/sequence-files/">Sequence Files</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Develop Custom Functions</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/develop-custom-functions-introduction/">Develop Custom Functions Introduction</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/developing-a-simple-function/">Developing a Simple Function</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/tutorial-develop-a-simple-function/">Tutorial: Develop a Simple Function</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/developing-an-aggregate-function/">Developing an Aggregate Function</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Adding Custom Functions to Drill</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/adding-custom-functions-to-drill-introduction/">Adding Custom Functions to Drill Introduction</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/manually-adding-custom-functions-to-drill/">Manually Adding Custom Functions to Drill</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/creating-custom-authenticators/">Creating Custom Authenticators</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/dynamic-udfs/">Dynamic UDFs</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/using-custom-functions-in-queries/">Using Custom Functions in Queries</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/custom-function-interfaces/">Custom Function Interfaces</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a class="reference internal" href="/docs/troubleshooting/">Troubleshooting</a></li>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Developer Information</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/rest-api/">REST API</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Develop Drill</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/compiling-drill-from-source/">Compiling Drill from Source</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Contribute to Drill</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/apache-drill-contribution-guidelines/">Apache Drill Contribution Guidelines</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/apache-drill-contribution-ideas/">Apache Drill Contribution Ideas</a></li>
+              
+            </ul>
+            
+          
+            
+              <li class="toctree-l2"><a href="javascript: void(0);">Design Docs</a></li>
+              <ul style="display: none">
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/drill-plan-syntax/">Drill Plan Syntax</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/rpc-overview/">RPC Overview</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/query-stages/">Query Stages</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/useful-research/">Useful Research</a></li>
+              
+                <li class="toctree-l3"><a class="reference internal" href="/docs/value-vectors/">Value Vectors</a></li>
+              
+            </ul>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Release Notes</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-1-11-0-release-notes/">Apache Drill 1.11.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-1-10-0-release-notes/">Apache Drill 1.10.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-1-9-0-release-notes/">Apache Drill 1.9.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-1-8-0-release-notes/">Apache Drill 1.8.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-1-7-0-release-notes/">Apache Drill 1.7.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-1-6-0-release-notes/">Apache Drill 1.6.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-1-5-0-release-notes/">Apache Drill 1.5.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-1-4-0-release-notes/">Apache Drill 1.4.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-1-3-0-release-notes/">Apache Drill 1.3.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-1-2-0-release-notes/">Apache Drill 1.2.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-1-1-0-release-notes/">Apache Drill 1.1.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-1-0-0-release-notes/">Apache Drill 1.0.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-9-0-release-notes/">Apache Drill 0.9.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-8-0-release-notes/">Apache Drill 0.8.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-7-0-release-notes/">Apache Drill 0.7.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-6-0-release-notes/">Apache Drill 0.6.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-5-0-release-notes/">Apache Drill 0.5.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-0-4-0-release-notes/">Apache Drill 0.4.0 Release Notes</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-m1-release-notes-apache-drill-alpha/">Apache Drill M1 Release Notes (Apache Drill Alpha)</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/apache-drill-m1-release-notes-apache-drill-alpha/">Apache Drill M1 Release Notes (Apache Drill Alpha)</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a href="javascript: void(0);">Sample Datasets</a></li>
+          <ul style="display: none">
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/aol-search/">AOL Search</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/enron-emails/">Enron Emails</a></li>
+            
+          
+            
+              <li class="toctree-l2"><a class="reference internal" href="/docs/wikipedia-edit-history/">Wikipedia Edit History</a></li>
+            
+          
+          </ul>
+        
+      
+        
+          <li class="toctree-l1"><a class="reference internal" href="/docs/project-bylaws/">Project Bylaws</a></li>
+        
+      
+      </ul>
+
+    </div>
+  </div>
+</aside>
+
+
+<nav class="breadcrumbs">
+  <li><a href="/docs/">Docs</a></li>
+ 
+  
+    <li><a href="/docs/performance-tuning/">Performance Tuning</a></li>
+  
+    <li><a href="/docs/query-plans-and-tuning/">Query Plans and Tuning</a></li>
+  
+  <li>Throttling</li>
+</nav>
+
+<div class="main-content-wrapper">
+  <div class="main-content">
+
+    
+      <a class="edit-link" href="https://github.com/apache/drill/blob/gh-pages/_docs/performance-tuning/query-plans-and-tuning/065-throttling.md" target="_blank"><i class="fa fa-pencil-square-o"></i></a>
+    
+
+    <div class="int_title left">
+      <h1>Throttling</h1>
+
+    </div>
+
+     Nov 21, 2016
+
+    <link href="/css/docpage.css" rel="stylesheet" type="text/css">
+
+    <div class="int_text" align="left">
+      
+        <p>Drill 1.12 introduces throttling. Throttling limits the number of concurrent queries that run to prevent queries from failing with out-of-memory errors. When you enable throttling, you configure the number of concurrent queries that can run and the resource requirements for each query. Drill calculates the amount of memory to assign per query per node.</p>
+
+<p>If throttling is disabled, you most likely need to increase the amount of memory assigned to the planner.memory.max_query_memory_per_node option based on the amount of direct memory that Drill will allocate to the Sort and Hash Aggregate operators during each query on a node. Drill must decide how much memory to assign to each of these operators, without knowing how many concurrent queries might run. If Drill does not give enough memory to the Sort and Hash Aggregate operators, queries fail. Using the throttling feature prevents this from happening.</p>
+
+<h2 id="configuring-throttling">Configuring Throttling</h2>
+
+<p>You can enable and configure query queuing using system options that you set in the Drill Web Console or through SQL statements. The examples in this document use SQL statements. </p>
+
+<p><strong>Note:</strong> The memory for the small and large query queues is calculated as:  </p>
+<div class="highlight"><pre><code class="language-text" data-lang="text">   Memory unit = small_queue + (large queue * memory_ratio)
+   Total memory available = total_direct_mem * (1 - memory_reserve_ratio)
+   SQueue memory allocation = total_mem_available/memory_unit
+   LQueue memory allocation = SQueue_memory_allocation * memory_ratio  
+</code></pre></div>
+<h3 id="enable-throttling">Enable Throttling</h3>
+
+<p>You can turn throttling on and off using the exec.queue.enable option, as shown:</p>
+<div class="highlight"><pre><code class="language-text" data-lang="text">   ALTER SYSTEM SET `exec.queue.enable` = true
+</code></pre></div>
+<p>The main page of the Drill Web Console shows the current queue configuration when throttling is enabled.  </p>
+
+<p><img src="https://i.imgur.com/qfzE2pR.png" alt="">  </p>
+
+<h3 id="configuring-queue-sizes">Configuring Queue Sizes</h3>
+
+<p>Determine how many queries run well concurrently on the system. Set the queue limits to the number of queries that can run concurrently. Be conservative when setting the numbers; start small and work upward. The larger the number, the smaller the amount of memory given to each query, which can force spilling and eventually cause out-of-memory errors. </p>
+
+<p>You can set the queue sizes using the exec.queue.large and exec.queue.small options, as shown:</p>
+<div class="highlight"><pre><code class="language-text" data-lang="text">   ALTER SYSTEM SET `exec.queue.large` = 4
+   ALTER SYSTEM SET `exec.queue.small` = 10
+</code></pre></div>
+<p><strong>Note:</strong> Values used here are examples. Evaluate your queries to determine the best queue sizes for your query load.  </p>
+
+<h3 id="configuring-queue-timeout">Configuring Queue Timeout</h3>
+
+<p>Queue timeout defines the amount of time a query waits to run. The default setting is five minutes, set in milliseconds. You can set the query timeout using the exec.queue.timeout_millis option, as shown:</p>
+<div class="highlight"><pre><code class="language-text" data-lang="text">   ALTER SYSTEM SET `exec.queue.timeout_millis` = 180000
+</code></pre></div>
+<p><strong>Note:</strong> Calculate the number of milliseconds:</p>
+<div class="highlight"><pre><code class="language-text" data-lang="text">   Ms = 3 mins. * 60 seconds/minute * 1000 ms/sec = 180,000
+</code></pre></div>
+<p>Once a queue has the maximum number of queries running, subsequent queries enter the queue and wait for a free slot. For example, if the small queue size is set to ten, ten small queries can run. The eleventh query waits until one of the first ten queries completes.  </p>
+
+<h3 id="configuring-the-queue-threshold">Configuring the Queue Threshold</h3>
+
+<p>The queue threshold tells Drill how to sort queries into the small and large queues. You can set the queue threshold through the exec.queue.threshold option, as shown:</p>
+<div class="highlight"><pre><code class="language-text" data-lang="text">   ALTER SYSTEM SET `exec.queue.threshold` = 123,000,000
+</code></pre></div>
+<p>The value that you set represents the total query cost, as computed by the planner. The value does not directly map to physical numbers, however it is derived from row count, CPU, network cost, and so on. </p>
+
+<p>Before you set the value, experiment by running queries that you consider small and large, then look at the total cost per query in the Drill Web Console, and pick a number in between when setting the threshold option.  </p>
+
+<p><img src="https://i.imgur.com/5kpdkCy.png" alt="">  </p>
+
+<h3 id="configuring-the-memory-ratio">Configuring the Memory Ratio</h3>
+
+<p>By default, Drill assumes that large queries use 10x the memory of small queries. You can change the memory ration using the exec.queue.memory_ratio option, as shown:</p>
+<div class="highlight"><pre><code class="language-text" data-lang="text">   ALTER SYSTEM SET `exec.queue.memory_ratio` = 8
+</code></pre></div>
+<p>The default setting is 10, however if by experimentation you find that another number would be better, change the ratio to meet the needs of your queries.  </p>
+
+<h3 id="configuring-the-memory-reserve-ratio">Configuring the Memory Reserve Ratio</h3>
+
+<p>Only the Sort and Hash Aggregate operators observer a memory limit and <a href="/docs/sort-based-and-hash-based-memory-constrained-operators/#spill-to-disk">spill to disk</a>. Other operators are not managed and the amount of memory needed for these other operators varies based on your specific queries. To account for these operators, you can set a memory reserve. 
+The default reserve is 20% (0.2), but join-heavy workloads may need a larger value such as 50% or more.</p>
+
+<p>You can change the memory reserve ration using the exec.queue.memory_reserve_ratio option, as shown:</p>
+<div class="highlight"><pre><code class="language-text" data-lang="text">   ALTER SYSTEM SET `exec.queue.memory_reserve_ratio` = 0.5  
+</code></pre></div>
+<h2 id="tuning">Tuning</h2>
+
+<p>To use query profiles to determine the proper parameters: </p>
+
+<ul>
+<li>Set the query sizes conservatively to ensure queries succeed.<br></li>
+<li>Experiment to adjust the size threshold by observing actual costs for typical queries.<br></li>
+<li>Tweak the memory settings if problems occur such as out-of-memory due to joins and so on.</li>
+</ul>
+
+    
+      
+        <div class="doc-nav">
+  
+  <span class="previous-toc"><a href="/docs/enabling-query-queuing/">← Enabling Query Queuing</a></span><span class="next-toc"><a href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy →</a></span>
+</div>
+
+    
+    </div>
+  </div>
+</div>
+
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+  <p class="push"></p>
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+<div class="wrapper">
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+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
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+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
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+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
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+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
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+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/use/index.html
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                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/useful-research/index.html
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                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/using-apache-drill-with-tableau-10-2/index.html
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@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
             </ul>

http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/using-apache-drill-with-tableau-9-desktop/index.html
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diff --git a/docs/using-apache-drill-with-tableau-9-desktop/index.html b/docs/using-apache-drill-with-tableau-9-desktop/index.html
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@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
             </ul>

http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/using-apache-drill-with-tableau-9-server/index.html
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diff --git a/docs/using-apache-drill-with-tableau-9-server/index.html b/docs/using-apache-drill-with-tableau-9-server/index.html
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@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
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http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/using-custom-functions-in-queries/index.html
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@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
             </ul>

http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/using-drill-explorer/index.html
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@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
             </ul>

http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/using-drill-with-bi-tools-introduction/index.html
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@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
             </ul>

http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/using-drill-with-bi-tools/index.html
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diff --git a/docs/using-drill-with-bi-tools/index.html b/docs/using-drill-with-bi-tools/index.html
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@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
             </ul>

http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/using-information-builders-webfocus-with-apache-drill/index.html
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diff --git a/docs/using-information-builders-webfocus-with-apache-drill/index.html b/docs/using-information-builders-webfocus-with-apache-drill/index.html
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@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
             </ul>

http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/using-jdbc-with-squirrel-on-windows/index.html
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diff --git a/docs/using-jdbc-with-squirrel-on-windows/index.html b/docs/using-jdbc-with-squirrel-on-windows/index.html
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@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
             </ul>

http://git-wip-us.apache.org/repos/asf/drill-site/blob/05290e11/docs/using-microstrategy-analytics-with-apache-drill/index.html
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diff --git a/docs/using-microstrategy-analytics-with-apache-drill/index.html b/docs/using-microstrategy-analytics-with-apache-drill/index.html
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@@ -621,6 +621,8 @@
               
                 <li class="toctree-l3"><a class="reference internal" href="/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
               
+                <li class="toctree-l3"><a class="reference internal" href="/docs/throttling/">Throttling</a></li>
+              
                 <li class="toctree-l3"><a class="reference internal" href="/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling Parallelization to Balance Performance with Multi-Tenancy</a></li>
               
             </ul>


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