Read and write metrics misleading/not helpful
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Key: HDFS-942
URL: https://issues.apache.org/jira/browse/HDFS-942
Project: Hadoop HDFS
Issue Type: Bug
Reporter: ryan rawson
the metrics wrap the entire readBlock() writeBlock() call (in DataXciever#run())
The problem with this is it includes the client socket read/write time. This
means if a client is slow at streaming a write block (eg: in hbase) then it
skews the write metrics and makes it look like the server is really slow. Same
problem with reads.
It would be nice if reads/writes meant actually local disk io and related
processing (eg: checksum verification/generation)
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