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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-17684) HoS memory issues with MapJoinMemoryExhaustionHandler
Date Thu, 13 Sep 2018 02:01:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-17684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16612936#comment-16612936
] 

Hive QA commented on HIVE-17684:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12939352/HIVE-17684.07.patch

{color:red}ERROR:{color} -1 due to no test(s) being added or modified.

{color:red}ERROR:{color} -1 due to 5 failed/errored test(s), 14936 tests executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[auto_join25] (batchId=77)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[auto_join_without_localtask] (batchId=1)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[infer_bucket_sort_convert_join] (batchId=57)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[mapjoin_hook] (batchId=13)
org.apache.hive.jdbc.TestJdbcWithMiniLlapArrow.testKillQuery (batchId=251)
{noformat}

Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/13746/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/13746/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-13746/

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
Tests exited with: TestsFailedException: 5 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12939352 - PreCommit-HIVE-Build

> HoS memory issues with MapJoinMemoryExhaustionHandler
> -----------------------------------------------------
>
>                 Key: HIVE-17684
>                 URL: https://issues.apache.org/jira/browse/HIVE-17684
>             Project: Hive
>          Issue Type: Bug
>          Components: Spark
>            Reporter: Sahil Takiar
>            Assignee: Misha Dmitriev
>            Priority: Major
>         Attachments: HIVE-17684.01.patch, HIVE-17684.02.patch, HIVE-17684.03.patch, HIVE-17684.04.patch,
HIVE-17684.05.patch, HIVE-17684.06.patch, HIVE-17684.07.patch
>
>
> We have seen a number of memory issues due the {{HashSinkOperator}} use of the {{MapJoinMemoryExhaustionHandler}}.
This handler is meant to detect scenarios where the small table is taking too much space in
memory, in which case a {{MapJoinMemoryExhaustionError}} is thrown.
> The configs to control this logic are:
> {{hive.mapjoin.localtask.max.memory.usage}} (default 0.90)
> {{hive.mapjoin.followby.gby.localtask.max.memory.usage}} (default 0.55)
> The handler works by using the {{MemoryMXBean}} and uses the following logic to estimate
how much memory the {{HashMap}} is consuming: {{MemoryMXBean#getHeapMemoryUsage().getUsed()
/ MemoryMXBean#getHeapMemoryUsage().getMax()}}
> The issue is that {{MemoryMXBean#getHeapMemoryUsage().getUsed()}} can be inaccurate.
The value returned by this method returns all reachable and unreachable memory on the heap,
so there may be a bunch of garbage data, and the JVM just hasn't taken the time to reclaim
it all. This can lead to intermittent failures of this check even though a simple GC would
have reclaimed enough space for the process to continue working.
> We should re-think the usage of {{MapJoinMemoryExhaustionHandler}} for HoS. In Hive-on-MR
this probably made sense to use because every Hive task was run in a dedicated container,
so a Hive Task could assume it created most of the data on the heap. However, in Hive-on-Spark
there can be multiple Hive Tasks running in a single executor, each doing different things.



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