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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3970) Counters written to the job history cannot be recovered back
Date Tue, 09 Sep 2008 05:29:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12629395#action_12629395
] 

Hadoop QA commented on HADOOP-3970:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12389722/HADOOP-3970-v4.1.patch
  against trunk revision 693048.

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

    +1 tests included.  The patch appears to include 3 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 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/Hadoop-Patch/3213/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3213/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3213/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3213/console

This message is automatically generated.

> Counters written to the job history cannot be recovered back
> ------------------------------------------------------------
>
>                 Key: HADOOP-3970
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3970
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Amar Kamat
>            Assignee: Amar Kamat
>         Attachments: HADOOP-3970-v1.patch, HADOOP-3970-v2.patch, HADOOP-3970-v3.patch,
HADOOP-3970-v4.1.patch, HADOOP-3970-v4.patch
>
>
> Counters that are written to the JobHistory are stringified using {{Counters.makeCompactString()}}.
The format in which this api converts the counter into a string is _groupname.countername:value_.
The problem is that _groupname_ and _countername_ can contain a '.' and hence recovering the
counter becomes difficult. Since JobHistory can be used for various purposes, reconstructing
the counter object back might be useful. One such usecase is HADOOP-3245. There should be
some way to recover the counter object back from its string representation and also to keep
the string version readable.

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