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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-15178) ORC stripe merge may produce many MR jobs and no merge if split size is small
Date Fri, 18 Nov 2016 04:01:01 GMT

     [ https://issues.apache.org/jira/browse/HIVE-15178?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sergey Shelukhin updated HIVE-15178:
------------------------------------
    Attachment: HIVE-15178.03.patch

And aaaagaaaain

> ORC stripe merge may produce many MR jobs and no merge if split size is small
> -----------------------------------------------------------------------------
>
>                 Key: HIVE-15178
>                 URL: https://issues.apache.org/jira/browse/HIVE-15178
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>         Attachments: HIVE-15178.01.patch, HIVE-15178.03.patch, HIVE-15178.03.patch, HIVE-15178.patch
>
>
> orc_createas1
> logs the following:
> {noformat}
> 2016-11-10T13:38:54,366  INFO [LocalJobRunner Map Task Executor #0] mapred.MapTask: Processing
split: Paths:/Users/sergey/git/hivegit2/itests/qtest/target/warehouse/.hive-staging_hive_2016-11-10_13-38-52_334_1323113125332102866-1/-ext-10004/000001_0:2400+100InputFormatClass:
org.apache.hadoop.hive.ql.io.orc.OrcFileStripeMergeInputFormat
> 2016-11-10T13:38:54,373  INFO [LocalJobRunner Map Task Executor #0] mapred.MapTask: Processing
split: Paths:/Users/sergey/git/hivegit2/itests/qtest/target/warehouse/.hive-staging_hive_2016-11-10_13-38-52_334_1323113125332102866-1/-ext-10004/000001_0:2500+100InputFormatClass:
org.apache.hadoop.hive.ql.io.orc.OrcFileStripeMergeInputFormat
> 2016-11-10T13:38:54,380  INFO [LocalJobRunner Map Task Executor #0] mapred.MapTask: Processing
split: Paths:/Users/sergey/git/hivegit2/itests/qtest/target/warehouse/.hive-staging_hive_2016-11-10_13-38-52_334_1323113125332102866-1/-ext-10004/000001_0:2600+100InputFormatClass:
org.apache.hadoop.hive.ql.io.orc.OrcFileStripeMergeInputFormat
> 2016-11-10T13:38:54,387  INFO [LocalJobRunner Map Task Executor #0] mapred.MapTask: Processing
split: Paths:/Users/sergey/git/hivegit2/itests/qtest/target/warehouse/.hive-staging_hive_2016-11-10_13-38-52_334_1323113125332102866-1/-ext-10004/000001_0:2700+100InputFormatClass:
org.apache.hadoop.hive.ql.io.orc.OrcFileStripeMergeInputFormat
> ...
> {noformat}
> It tries to merge 2 files, but instead ends up running tons of MR tasks for every 100
bytes and produces 2 files again (I assume most tasks don't produce the files because the
split at a random 100-byte offset is invalid).
> {noformat}
> 2016-11-10T13:38:53,985  INFO [LocalJobRunner Map Task Executor #0] OrcFileMergeOperator:
Merged stripe from file pfile:/Users/sergey/git/hivegit2/itests/qtest/target/warehouse/.hive-staging_hive_2016-11-10_13-38-52_334_1323113125332102866-1/-ext-10004/000000_0
[ offset : 3 length: 2770 row: 500 ]
> 2016-11-10T13:38:53,995  INFO [LocalJobRunner Map Task Executor #0] exec.AbstractFileMergeOperator:
renamed path pfile:/Users/sergey/git/hivegit2/itests/qtest/target/warehouse/.hive-staging_hive_2016-11-10_13-38-52_334_1323113125332102866-1/_task_tmp.-ext-10002/_tmp.000002_0
to pfile:/Users/sergey/git/hivegit2/itests/qtest/target/warehouse/.hive-staging_hive_2016-11-10_13-38-52_334_1323113125332102866-1/_tmp.-ext-10002/000002_0
. File size is 2986
> 2016-11-10T13:38:54,206  INFO [LocalJobRunner Map Task Executor #0] OrcFileMergeOperator:
Merged stripe from file pfile:/Users/sergey/git/hivegit2/itests/qtest/target/warehouse/.hive-staging_hive_2016-11-10_13-38-52_334_1323113125332102866-1/-ext-10004/000001_0
[ offset : 3 length: 2770 row: 500 ]
> 2016-11-10T13:38:54,215  INFO [LocalJobRunner Map Task Executor #0] exec.AbstractFileMergeOperator:
renamed path pfile:/Users/sergey/git/hivegit2/itests/qtest/target/warehouse/.hive-staging_hive_2016-11-10_13-38-52_334_1323113125332102866-1/_task_tmp.-ext-10002/_tmp.000030_0
to pfile:/Users/sergey/git/hivegit2/itests/qtest/target/warehouse/.hive-staging_hive_2016-11-10_13-38-52_334_1323113125332102866-1/_tmp.-ext-10002/000030_0
. File size is 2986
> {noformat}
> This is because the test sets the max split size to 100. Merge jobs is supposed to override
that, but that doesn't happen somehow.



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