Zichen Sun created MAPREDUCE-7158:
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Summary: Inefficient Flush Logic in JobHistory EventWriter
Key: MAPREDUCE-7158
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7158
Project: Hadoop Map/Reduce
Issue Type: Bug
Reporter: Zichen Sun
In HDFS, if the flush is implemented to send server request to actually commit
the pending writes on the storage service side, we could observe in the
benchmark runs that the MR jobs are taking much longer. From investigation we
see the current implementation for writing events doesn't look right:
EventWriter# write()
This flush is redundant and this statement should be removed. It defeats the
purpose of having a separate flush function itself.
Encoder.flush calls flush of the underlying output stream
After patching with the fix the MR jobs could complete normally, please kindly
find the patch in attached.
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