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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12492) MapJoin: 4 million unique integers seems to be a probe plateau
Date Mon, 20 Feb 2017 15:03:44 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15874657#comment-15874657
] 

Hive QA commented on HIVE-12492:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12853562/HIVE-12492.patch

{color:green}SUCCESS:{color} +1 due to 1 test(s) being added or modified.

{color:red}ERROR:{color} -1 due to 8 failed/errored test(s), 10250 tests executed
*Failed tests:*
{noformat}
TestDerbyConnector - did not produce a TEST-*.xml file (likely timed out) (batchId=235)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[cbo_rp_auto_join1] (batchId=3)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[join31] (batchId=81)
org.apache.hadoop.hive.cli.TestEncryptedHDFSCliDriver.testCliDriver[encryption_join_with_different_encryption_keys]
(batchId=159)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[multiMapJoin2] (batchId=152)
org.apache.hadoop.hive.cli.TestPerfCliDriver.testCliDriver[query14] (batchId=223)
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver[join31] (batchId=133)
org.apache.hive.beeline.TestBeeLineWithArgs.testQueryProgressParallel (batchId=211)
{noformat}

Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/3657/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/3657/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-3657/

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
Tests exited with: TestsFailedException: 8 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12853562 - PreCommit-HIVE-Build

> MapJoin: 4 million unique integers seems to be a probe plateau
> --------------------------------------------------------------
>
>                 Key: HIVE-12492
>                 URL: https://issues.apache.org/jira/browse/HIVE-12492
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Planning
>    Affects Versions: 1.3.0, 1.2.1, 2.0.0
>            Reporter: Gopal V
>            Assignee: Jesus Camacho Rodriguez
>         Attachments: HIVE-12492.patch
>
>
> After 4 million keys, the map-join implementation seems to suffer from a performance
degradation. 
> The hashtable build & probe time makes this very inefficient, even if the data is
very compact (i.e 2 ints).
> Falling back onto the shuffle join or bucket map-join is useful after 2^22 items.



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