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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1342) [Zebra] Avoid making unnecessary name node calls for writes in Zebra
Date Thu, 22 Apr 2010 02:11:49 GMT

    [ https://issues.apache.org/jira/browse/PIG-1342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12859625#action_12859625

Hadoop QA commented on PIG-1342:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 936395.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 6 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit

    -1 core tests.  The patch failed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Pig-Patch-h7.grid.sp2.yahoo.net/298/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Pig-Patch-h7.grid.sp2.yahoo.net/298/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: http://hudson.zones.apache.org/hudson/job/Pig-Patch-h7.grid.sp2.yahoo.net/298/console

This message is automatically generated.

> [Zebra] Avoid making unnecessary name node calls for writes in Zebra
> --------------------------------------------------------------------
>                 Key: PIG-1342
>                 URL: https://issues.apache.org/jira/browse/PIG-1342
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: 0.6.0, 0.7.0
>            Reporter: Chao Wang
>            Assignee: Chao Wang
>             Fix For: 0.8.0
>         Attachments: PIG-1342.patch, PIG-1342.patch
> Currently, table and column group level meta data is extracted from job configuration
object and written onto HDFS disk within checkOutputSpec(). Later on, writers at back end
will open these files to access the meta data for doing writes. This puts extra load to name
node since all writers need to make name node calls to open files. 
> We propose the following approach to this problem:
> For writers at back end, they extract meta information from job configuration object
directly, rather than making name node calls and going to HDFS disk to fetch the information.

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