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Posted to mapreduce-issues@hadoop.apache.org by "Sangjin Lee (JIRA)" <ji...@apache.org> on 2013/03/05 20:08:14 UTC

[jira] [Created] (MAPREDUCE-5046) backport MAPREDUCE-1423 to mapred.lib.CombineFileInputFormat

Sangjin Lee created MAPREDUCE-5046:
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             Summary: backport MAPREDUCE-1423 to mapred.lib.CombineFileInputFormat
                 Key: MAPREDUCE-5046
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5046
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: client
    Affects Versions: 1.1.1
            Reporter: Sangjin Lee


The CombineFileInputFormat class in org.apache.hadoop.mapred.lib (the old API) has a couple of issues. These issues were addressed in the new API (MAPREDUCE-1423), but the old class was not fixed.

The main issue the JIRA refers to is a performance problem. However, IMO there is a more serious problem which is a thread-safety issue (rackToNodes) which was fixed alongside.

What is the policy on addressing issues in the old API? Can we backport this to the old class?

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