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https://issues.apache.org/jira/browse/HIVE-22411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16963676#comment-16963676
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Hive QA commented on HIVE-22411:
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| (x) *{color:red}-1 overall{color}* |
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| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 12s{color}
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/data/hiveptest/logs/PreCommit-HIVE-Build-19222/patches/PreCommit-HIVE-Build-19222.patch
does not apply to master. Rebase required? Wrong Branch? See
http://cwiki.apache.org/confluence/display/Hive/HowToContribute for help.
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| Console output |
http://104.198.109.242/logs//PreCommit-HIVE-Build-19222/yetus.txt |
| Powered by | Apache Yetus http://yetus.apache.org |
This message was automatically generated.
> Performance degradation on single row inserts
> ---------------------------------------------
>
> Key: HIVE-22411
> URL: https://issues.apache.org/jira/browse/HIVE-22411
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Reporter: Attila Magyar
> Assignee: Attila Magyar
> Priority: Major
> Fix For: 4.0.0
>
> Attachments: HIVE-22411.1.patch, Screen Shot 2019-10-17 at 8.40.50
> PM.png
>
>
> Executing single insert statements on a transactional table effects write
> performance on a s3 file system. Each insert creates a new delta directory.
> After each insert hive calculates statistics like number of file in the table
> and total size of the table. In order to calculate these, it traverses the
> directory recursively. During the recursion for each path a separate
> listStatus call is executed. In the end the more delta directory you have the
> more time it takes to calculate the statistics.
> Therefore insertion time goes up linearly:
> !Screen Shot 2019-10-17 at 8.40.50 PM.png|width=601,height=436!
> The fix is to use fs.listFiles(path, /**recursive**/ true) instead the
> handcrafter recursive method/
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