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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-872) use distributed cache for the replicated data set in FR join
Date Mon, 23 Nov 2009 19:25:39 GMT

    [ https://issues.apache.org/jira/browse/PIG-872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12781560#action_12781560
] 

Hadoop QA commented on PIG-872:
-------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12425805/PIG_872.patch.1
  against trunk revision 882818.

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

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no tests are needed for this patch.

    +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
warnings.

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

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

Test results: http://hudson.zones.apache.org/hudson/job/Pig-Patch-h8.grid.sp2.yahoo.net/51/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Pig-Patch-h8.grid.sp2.yahoo.net/51/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: http://hudson.zones.apache.org/hudson/job/Pig-Patch-h8.grid.sp2.yahoo.net/51/console

This message is automatically generated.

> use distributed cache for the replicated data set in FR join
> ------------------------------------------------------------
>
>                 Key: PIG-872
>                 URL: https://issues.apache.org/jira/browse/PIG-872
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Olga Natkovich
>            Assignee: Sriranjan Manjunath
>         Attachments: PIG_872.patch.1
>
>
> Currently, the replicated file is read directly from DFS by all maps. If the number of
the concurrent maps is huge, we can overwhelm the NameNode with open calls.
> Using distributed cache will address the issue and might also give a performance boost
since the file will be copied locally once and the reused by all tasks running on the same
machine.
> The basic approach would be to use cacheArchive to place the file into the cache on the
frontend and on the backend, the tasks would need to refer to the data using path from the
cache.
> Note that cacheArchive does not work in Hadoop local mode. (Not a problem for us right
now as we don't use it.)

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