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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Work logged] (HIVE-21279) Avoid moving/rename operation in FileSink op for SELECT queries
Date Mon, 01 Apr 2019 23:10:02 GMT

     [ https://issues.apache.org/jira/browse/HIVE-21279?focusedWorklogId=221533&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-221533
]

ASF GitHub Bot logged work on HIVE-21279:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 01/Apr/19 23:09
            Start Date: 01/Apr/19 23:09
    Worklog Time Spent: 10m 
      Work Description: vineetgarg02 commented on pull request #582: Hive 21386: Extend the
fetch task enhancement done in HIVE-21279 to make it work with query result cache
URL: https://github.com/apache/hive/pull/582#discussion_r271083355
 
 

 ##########
 File path: ql/src/java/org/apache/hadoop/hive/ql/Context.java
 ##########
 @@ -774,21 +812,25 @@ public void setResDir(Path resDir) {
     resDirPaths = null;
   }
 
-  public void clear() throws IOException {
+  public void clear() throws IOException{
 
 Review comment:
   Rest of the calls are from immediately after executing tasks. Since result hasn't been
cached at that point it is safe for the context clear to delete the result cache files (if
there are any)
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 221533)
    Time Spent: 2.5h  (was: 2h 20m)

> Avoid moving/rename operation in FileSink op for SELECT queries
> ---------------------------------------------------------------
>
>                 Key: HIVE-21279
>                 URL: https://issues.apache.org/jira/browse/HIVE-21279
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Planning
>            Reporter: Vineet Garg
>            Assignee: Vineet Garg
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 4.0.0
>
>         Attachments: HIVE-21279.1.patch, HIVE-21279.10.patch, HIVE-21279.11.patch, HIVE-21279.12.patch,
HIVE-21279.13.patch, HIVE-21279.2.patch, HIVE-21279.3.patch, HIVE-21279.4.patch, HIVE-21279.5.patch,
HIVE-21279.6.patch, HIVE-21279.7.patch, HIVE-21279.8.patch, HIVE-21279.9.patch
>
>          Time Spent: 2.5h
>  Remaining Estimate: 0h
>
> Currently at the end of a job FileSink operator moves/rename temp directory to another
directory from which FetchTask fetches result. This is done to avoid fetching potential partial/invalid
files by failed/runway tasks. This operation is expensive for cloud storage. It could be avoided
if FetchTask is passed on set of files to read from instead of whole directory.



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