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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