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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Work logged] (HIVE-20137) Truncate for Transactional tables should use base_x
Date Thu, 01 Oct 2020 08:38:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-20137?focusedWorklogId=493344&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-493344
]

ASF GitHub Bot logged work on HIVE-20137:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 01/Oct/20 08:37
            Start Date: 01/Oct/20 08:37
    Worklog Time Spent: 10m 
      Work Description: deniskuzZ commented on a change in pull request #1532:
URL: https://github.com/apache/hive/pull/1532#discussion_r498072413



##########
File path: ql/src/java/org/apache/hadoop/hive/ql/ddl/table/misc/truncate/TruncateTableAnalyzer.java
##########
@@ -112,23 +113,27 @@ private void checkTruncateEligibility(ASTNode ast, ASTNode root, String
tableNam
 
   private void addTruncateTableOutputs(ASTNode root, Table table, Map<String, String>
partitionSpec)
       throws SemanticException {
+    boolean shared = AcidUtils.isTransactionalTable(table) &&

Review comment:
       could we rename local var to truncateFiles or something (same as below)

##########
File path: standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/HiveMetaStore.java
##########
@@ -3357,6 +3355,52 @@ private void truncateTableInternal(String dbName, String tableName,
List<String>
       }
     }
 
+    /**
+     * Add an empty baseDir with a truncate metadatafile
+     * @param location
+     * @param writeId
+     * @param fs
+     * @throws Exception
+     */
+    private void addTruncateBaseFile(Path location, long writeId, FileSystem fs) throws Exception
{
+      Path basePath = new Path(location, AcidConstants.baseDir(writeId));
+      fs.mkdirs(basePath);
+      // We can not leave the folder empty, otherwise it will be skipped at some file listing
in AcidUtils
+      // No need for a data file, a simple metadata is enough

Review comment:
       Do you think it would make sense to move metaFile creation under MetaDataFile class,
not sure however it should be under AcidConstants?

##########
File path: ql/src/java/org/apache/hadoop/hive/ql/io/AcidUtils.java
##########
@@ -114,16 +114,16 @@
 public class AcidUtils {
   // This key will be put in the conf file when planning an acid operation
   public static final String CONF_ACID_KEY = "hive.doing.acid";
-  public static final String BASE_PREFIX = "base_";
+  public static final String BASE_PREFIX = AcidConstants.BASE_PREFIX;

Review comment:
       could we remove those and reference constants from AcidConstants directly




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 493344)
    Time Spent: 0.5h  (was: 20m)

> Truncate for Transactional tables should use base_x
> ---------------------------------------------------
>
>                 Key: HIVE-20137
>                 URL: https://issues.apache.org/jira/browse/HIVE-20137
>             Project: Hive
>          Issue Type: Improvement
>          Components: Transactions
>    Affects Versions: 3.0.0
>            Reporter: Eugene Koifman
>            Assignee: Peter Varga
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> This is a follow up to HIVE-19387.
> Once we have a lock that blocks writers but not readers (HIVE-19369), it would make sense
to make truncate create a new base_x, where is x is a writeId in current txn - the same as
Insert Overwrite does.
> This would mean it can work w/o interfering with existing writers.



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