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From "Robert Chansler (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3970) Counters written to the job history cannot be recovered back
Date Tue, 21 Oct 2008 19:58:44 GMT

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

Robert Chansler updated HADOOP-3970:
------------------------------------

    Release Note: Added getEscapedCompactString() and fromEscapedCompactString() to Counters.java
to represent counters as Strings and to reconstruct the counters from the Strings.  (was:
Adds getEscapedCompactString() and fromEscapedCompactString() apis to Counters.java . These
apis provide the facility to represent counters as string and reconstruct the counter back
from the string.)

> 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
>             Fix For: 0.19.0
>
>         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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