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