Jason Lowe created MAPREDUCE-4954:
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Summary: ShuffleHandler logs excessively when channel closed
prematurely by reducer
Key: MAPREDUCE-4954
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4954
Project: Hadoop Map/Reduce
Issue Type: Bug
Affects Versions: 0.23.5, 2.0.3-alpha
Reporter: Jason Lowe
As initially reported in MAPREDUCE-4801, the shuffle protocol allows a reducer
to hangup the connection to a nodemanager after receiving the shuffle header.
This can introduce a connection reset IOException or a ClosedChannelException
on the nodemanager. Logging these is not very interesting, and adds a lot of
data to the NM log.
MAPREDUCE-4801 missed some places where these exceptions can occur, will post
sample exceptions below for reference.
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