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From "LiXin Ge (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11765) Fix:Performance regression due to incorrect use of DataChecksum
Date Mon, 08 May 2017 07:41:04 GMT
LiXin Ge created HDFS-11765:

             Summary: Fix:Performance regression due to incorrect use of DataChecksum
                 Key: HDFS-11765
                 URL: https://issues.apache.org/jira/browse/HDFS-11765
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: native, performance
    Affects Versions: 3.0.0-alpha1, 2.8.0
            Reporter: LiXin Ge
             Fix For: 3.0.0-alpha2

Recently I have upgraded my Hadoop version from 2.6 to 3.0, and I find that the write performance
decreased by 13%. After some days comparative analysis, It's seems introduced by HADOOP-10865.

Since James Thomas have done the work that native checksum can run against byte[] arrays instead
of just against byte buffers, we may use native method preferential because it runs faster
than others.[~szetszwo]] and [~iwasakims] could you take a look at this to see if  it make
bad effect on your benchmark test? [~tlipcon] could you help to see if I have make mistakes
in this patch?

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