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https://issues.apache.org/jira/browse/HIVE-12492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15880953#comment-15880953
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Hive QA commented on HIVE-12492:
--------------------------------
Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12854164/HIVE-12492.02.patch
{color:green}SUCCESS:{color} +1 due to 1 test(s) being added or modified.
{color:red}ERROR:{color} -1 due to 2 failed/errored test(s), 10255 tests
executed
*Failed tests:*
{noformat}
TestDerbyConnector - did not produce a TEST-*.xml file (likely timed out)
(batchId=235)
org.apache.hadoop.hive.cli.TestPerfCliDriver.testCliDriver[query14]
(batchId=223)
{noformat}
Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/3728/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/3728/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-3728/
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: 2 tests failed
{noformat}
This message is automatically generated.
ATTACHMENT ID: 12854164 - 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-12492.01.patch, HIVE-12492.02.patch,
> 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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