[jira] [Created] (HDFS-11765) Fix:Performance regression due to incorrect use of DataChecksum

["LiXin Ge (JIRA)" <ji...@apache.org>]

LiXin Ge created HDFS-11765:
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             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?
thanks!



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