FSDataOutputStream should not flush() inside close().
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Key: HADOOP-2863
URL: https://issues.apache.org/jira/browse/HADOOP-2863
Project: Hadoop Core
Issue Type: Bug
Components: fs
Reporter: Raghu Angadi
Fix For: 0.17.0
Why does FSDataOutputStream.close() call flush()? This stream itself does not
store any data that it needs to flush. It is a wrapper and it should just
invoke its outputstream's close().
For. e.g one bad side effect is that, in the case of DFSOutputStream which
extends FSOutputSummer, flush() inside close sends the current data even though
FSOutputSummer might have some data.. this left over data will be sent in side
close() (so it sends data in two different packets instead of one). Other
filesystems might have similar side effects.
I will submit a patch.
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