Counters written to the job history cannot be recovered back
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Key: HADOOP-3970
URL: https://issues.apache.org/jira/browse/HADOOP-3970
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Reporter: Amar Kamat
Counters that are written to the history are stringified using
{{Counters.getCompactString()}}. The format in which this api converts the
counter into a string is _groupname.countername:value_. The problem is that the
groupname and the countername can contain '.' and hence recovering the counter
back 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
the string representation and also to keep the stringified version readable.
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