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From "jiraposter@reviews.apache.org (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2201) reduce name node calls in hive by creating temporary directories
Date Fri, 24 Jun 2011 17:57:52 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13054584#comment-13054584
] 

jiraposter@reviews.apache.org commented on HIVE-2201:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/952/
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Review request for hive, Yongqiang He, Ning Zhang, and namit jain.


Summary
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reduce name node calls in hive by creating temporary directories


This addresses bug HIVE-2201.
    https://issues.apache.org/jira/browse/HIVE-2201


Diffs
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  trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/ExecDriver.java 1134223 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/FileSinkOperator.java 1134223 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/Utilities.java 1134223 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/io/RCFileOutputFormat.java 1134223 

Diff: https://reviews.apache.org/r/952/diff


Testing
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Thanks,

Siying



> reduce name node calls in hive by creating temporary directories
> ----------------------------------------------------------------
>
>                 Key: HIVE-2201
>                 URL: https://issues.apache.org/jira/browse/HIVE-2201
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Namit Jain
>            Assignee: Siying Dong
>         Attachments: HIVE-2201.1.patch, HIVE-2201.2.patch, HIVE-2201.3.patch
>
>
> Currently, in Hive, when a file gets written by a FileSinkOperator,
> the sequence of operations is as follows:
> 1. In tmp directory tmp1, create a tmp file _tmp_1
> 2. At the end of the operator, move
> /tmp1/_tmp_1 to /tmp1/1
> 3. Move directory /tmp1 to /tmp2
> 4. For all files in /tmp2, remove all files starting with _tmp and
> duplicate files.
> Due to speculative execution, a lot of temporary files are created
> in /tmp1 (or /tmp2). This leads to a lot of name node calls,
> specially for large queries.
> The protocol above can be modified slightly:
> 1. In tmp directory tmp1, create a tmp file _tmp_1
> 2. At the end of the operator, move
> /tmp1/_tmp_1 to /tmp2/1
> 3. Move directory /tmp2 to /tmp3
> 4. For all files in /tmp3, remove all duplicate files.
> This should reduce the number of tmp files.

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