A client should not send buffered data to datanodes on close of a file if the
data have already been flushed
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Key: HDFS-681
URL: https://issues.apache.org/jira/browse/HDFS-681
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Hairong Kuang
Suppose we have the following lines of pseducode:
{noformat}
1: DFSOutputstream out = dfs.create("file");
2: out.write("abc");
3: out.hflush("abc");
4: out.close();
{noformat}
Line 3 will force "abc" to be pushed to datanodes but "abc" are still kept in
the buffer for checksum purpose. Line 4 will force "abc" to be sent to
datanodes again. If the client has an additional check if the buffered data
have been flushed or not, we can eliminate this unnecessary packet.
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