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https://issues.apache.org/jira/browse/HADOOP-10674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14043506#comment-14043506
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Hudson commented on HADOOP-10674:
---------------------------------
SUCCESS: Integrated in Hadoop-Hdfs-trunk #1785 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/1785/])
HADOOP-10674. Improve PureJavaCrc32 performance and use java.util.zip.CRC32 for
Java 7 and above. (szetszwo:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1605239)
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/ChecksumFileSystem.java
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/ChecksumFs.java
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/zlib/BuiltInGzipDecompressor.java
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/DataChecksum.java
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/PureJavaCrc32.java
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestPureJavaCrc32.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSEditLogOp.java
> Rewrite the PureJavaCrc32 loop for performance improvement
> ----------------------------------------------------------
>
> Key: HADOOP-10674
> URL: https://issues.apache.org/jira/browse/HADOOP-10674
> Project: Hadoop Common
> Issue Type: Improvement
> Components: performance, util
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
> Fix For: 2.5.0
>
> Attachments: c10674_20140609.patch, c10674_20140609b.patch,
> c10674_20140610.patch, c10674_20140612.patch, c10674_20140619.patch,
> c10674_20140624.patch
>
>
> Below are some performance improvement opportunities performance improvement
> in PureJavaCrc32.
> - eliminate "off += 8; len -= 8;"
> - replace T8_x_start with hard coded constants
> - eliminate c0 - c7 local variables
> In my machine, there are 30% to 50% improvement for most of the cases.
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