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Posted to common-dev@hadoop.apache.org by "Amar Kamat (JIRA)" <ji...@apache.org> on 2008/09/01 17:22:44 UTC

[jira] Updated: (HADOOP-3970) Counters written to the job history cannot be recovered back

     [ https://issues.apache.org/jira/browse/HADOOP-3970?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Amar Kamat updated HADOOP-3970:
-------------------------------

    Attachment: HADOOP-3970-v3.patch

Uploading a new patch the fixes the findbugs warnings.

> 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
>         Attachments: HADOOP-3970-v1.patch, HADOOP-3970-v2.patch, HADOOP-3970-v3.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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