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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HIVE-10661) LLAP: investigate why GC with IO elevator disabled is so bad
Date Wed, 20 May 2015 19:19:02 GMT

     [ https://issues.apache.org/jira/browse/HIVE-10661?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sergey Shelukhin resolved HIVE-10661.
-------------------------------------
    Resolution: Invalid

NM, it may be just an effect of running longer for some other reasons. 

> LLAP: investigate why GC with IO elevator disabled is so bad
> ------------------------------------------------------------
>
>                 Key: HIVE-10661
>                 URL: https://issues.apache.org/jira/browse/HIVE-10661
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Sergey Shelukhin
>            Assignee: Prasanth Jayachandran
>
> Examples of running same query (Q1) on experimental setup, with Parallel GC, 12 times.

> Time, DAG name, DAG time, GC time counter.
> GC time counter on LLAP seems relatively reliable.
> Note that non-IO jobs are also much slower during some time. It may not be explained
entirely by GC, I am investigating it now.
> Running io and non-io on the same cluster w/o restarting produces these problems also
only on non-IO runs
> I may look at this later, after main GC tuning, but for now I decided to give up on this
since elevator will be on by default when using LLAP.
> {noformat}
> $ cat io-dag.csv 
> 2015-05-08 12:10:57,695,dag_1429683757595_0843_1,71142,953216
> 2015-05-08 12:11:41,769,dag_1429683757595_0843_2,43144,844430
> 2015-05-08 12:12:22,335,dag_1429683757595_0843_3,39828,866538
> 2015-05-08 12:13:01,327,dag_1429683757595_0843_4,38213,822179
> 2015-05-08 12:13:39,610,dag_1429683757595_0843_5,37513,863968
> 2015-05-08 12:14:19,293,dag_1429683757595_0843_6,38320,913591
> 2015-05-08 12:14:58,500,dag_1429683757595_0843_7,38587,972450
> 2015-05-08 12:15:39,017,dag_1429683757595_0843_8,39845,1085598
> 2015-05-08 12:16:19,708,dag_1429683757595_0843_9,39979,1165559
> 2015-05-08 12:17:03,174,dag_1429683757595_0843_10,42713,1447033
> 2015-05-08 12:17:47,557,dag_1429683757595_0843_11,43670,1454114
> 2015-05-08 12:18:31,440,dag_1429683757595_0843_12,43178,1380477
> $ cat noio-dag.csv 
> 2015-05-08 11:44:05,846,dag_1429683757595_0841_1,60740,1643276
> 2015-05-08 11:44:55,761,dag_1429683757595_0841_2,48984,1590546
> 2015-05-08 11:45:48,978,dag_1429683757595_0841_3,52353,1765823
> 2015-05-08 11:46:44,810,dag_1429683757595_0841_4,54930,1831224
> 2015-05-08 11:47:47,368,dag_1429683757595_0841_5,61677,2068089
> 2015-05-08 11:49:05,235,dag_1429683757595_0841_6,76725,2416709
> 2015-05-08 11:51:56,998,dag_1429683757595_0841_7,170575,3250698
> 2015-05-08 11:58:16,728,dag_1429683757595_0841_8,377732,5541900
> 2015-05-08 12:03:17,344,dag_1429683757595_0841_9,298682,1844769
> 2015-05-08 12:05:23,267,dag_1429683757595_0841_10,124954,1331763
> 2015-05-08 12:06:35,650,dag_1429683757595_0841_11,71350,1703387
> 2015-05-08 12:07:42,599,dag_1429683757595_0841_12,66143,1724482
> {noformat}



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