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https://issues.apache.org/jira/browse/HIVE-20656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16788462#comment-16788462
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Hive QA commented on HIVE-20656:
--------------------------------
Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12961767/HIVE-20656.3.patch
{color:red}ERROR:{color} -1 due to no test(s) being added or modified.
{color:green}SUCCESS:{color} +1 due to 15821 tests passed
Test results:
https://builds.apache.org/job/PreCommit-HIVE-Build/16422/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/16422/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-16422/
Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.YetusPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
{noformat}
This message is automatically generated.
ATTACHMENT ID: 12961767 - PreCommit-HIVE-Build
> Sensible defaults: Map aggregation memory configs are too aggressive
> --------------------------------------------------------------------
>
> Key: HIVE-20656
> URL: https://issues.apache.org/jira/browse/HIVE-20656
> Project: Hive
> Issue Type: Bug
> Affects Versions: 4.0.0, 3.2.0
> Reporter: Prasanth Jayachandran
> Assignee: Prasanth Jayachandran
> Priority: Major
> Attachments: HIVE-20656.1.patch, HIVE-20656.2.patch,
> HIVE-20656.3.patch
>
>
> The defaults for the following configs seems to be too aggressive. In java
> this can easily lead to several full GC pauses whose memory cannot be
> reclaimed.
> {code:java}
> HIVEMAPAGGRHASHMEMORY("hive.map.aggr.hash.percentmemory", (float) 0.99,
> "Portion of total memory to be used by map-side group aggregation hash
> table"),
> HIVEMAPAGGRMEMORYTHRESHOLD("hive.map.aggr.hash.force.flush.memory.threshold",
> (float) 0.9,
> "The max memory to be used by map-side group aggregation hash table.\n" +
> "If the memory usage is higher than this number, force to flush
> data"),{code}
>
> We can be little bit conservative for these configs to avoid getting into GC
> pause.
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