FAQ
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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postedFeb 2, '10 at 10:28p
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