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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-16329) TopN: TopNHash totalFreeMemory computation ignores free memory
Date Fri, 31 Mar 2017 01:11:41 GMT

    [ https://issues.apache.org/jira/browse/HIVE-16329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15950131#comment-15950131
] 

Hive QA commented on HIVE-16329:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12861318/HIVE-16329.2.patch

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

{color:red}ERROR:{color} -1 due to 3 failed/errored test(s), 10540 tests executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[comments] (batchId=35)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[vector_if_expr] (batchId=141)
org.apache.hive.hcatalog.api.TestHCatClient.testTransportFailure (batchId=172)
{noformat}

Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/4475/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/4475/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-4475/

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: 3 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12861318 - PreCommit-HIVE-Build

> TopN: TopNHash totalFreeMemory computation ignores free memory
> --------------------------------------------------------------
>
>                 Key: HIVE-16329
>                 URL: https://issues.apache.org/jira/browse/HIVE-16329
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 2.2.0, 3.0.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>         Attachments: HIVE-16329.1.patch, HIVE-16329.2.patch
>
>
> {code}
>       // TODO: For LLAP, assumption is off-heap cache.
>       final long memoryUsedPerExecutor = (memoryMXBean.getHeapMemoryUsage().getUsed()
/ numExecutors);
>       // this is total free memory available per executor in case of LLAP
>       totalFreeMemory = conf.getMaxMemoryAvailable() - memoryUsedPerExecutor;
> {code}
> {code}
> exec.TopNHash: isTez parameters -615768144 = 5312782848 - 71142611912 / 12
> {code}
> This turns off the TopNHash entirely causing something trivial like 
> {code}
> select c_custkey, count(1) from customer group by c_custkey limit 10;
> {code}
> To shuffle 30M rows instead of 10.



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