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https://issues.apache.org/jira/browse/HDFS-10331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15311883#comment-15311883
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Haohui Mai commented on HDFS-10331:
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Should we remove the unused code then?
> Use java.util.zip.CRC32 for java8 or above in libhadoop
> -------------------------------------------------------
>
> Key: HDFS-10331
> URL: https://issues.apache.org/jira/browse/HDFS-10331
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode, hdfs, hdfs-client
> Affects Versions: 2.6.0
> Reporter: He Tianyi
>
> In java8, performance of intrinsic CRC32 has been dramatically improved.
> See: https://bugs.openjdk.java.net/browse/JDK-7088419
> I carried an in-memory benchmark of throughput, on a server with two E5-2630
> v2 cpus, results:
> (single threaded)
> java7 java.util.zip.CRC32: 0.81GB/s
> hdfs DataChecksum, native: 1.46GB/s
> java8 java.util.zip.CRC32: 2.39GB/s
> hdfs DataChecksum, CRC32 on java8: 2.39GB/s
> IMHO I think we could either:
> A) provide a configuration for user to switch CRC32 implementations;
> or B) On java8 or above, always use intrinsic CRC32.
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