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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3970) Counters written to the job history cannot be recovered back
Date Tue, 09 Sep 2008 05:39:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12629397#action_12629397
] 

Amar Kamat commented on HADOOP-3970:
------------------------------------

Core test failed on TestDatanodeDeath. Not sure if its related to this patch or Counters.
Ran the same test on my machine and it passed.

> 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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