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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3528) Use native CRC32 in DFS write path
Date Tue, 24 Jun 2014 00:52:25 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14041545#comment-14041545
] 

Tsz Wo Nicholas Sze commented on HDFS-3528:
-------------------------------------------

Is the native library faster than the Java implementation only for CRC32C but not CRC32?

> Use native CRC32 in DFS write path
> ----------------------------------
>
>                 Key: HDFS-3528
>                 URL: https://issues.apache.org/jira/browse/HDFS-3528
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode, hdfs-client, performance
>    Affects Versions: 2.0.0-alpha
>            Reporter: Todd Lipcon
>            Assignee: James Thomas
>
> HDFS-2080 improved the CPU efficiency of the read path by using native SSE-enabled code
for CRC verification. Benchmarks of the write path show that it's often CPU bound by checksums
as well, so we should make the same improvement there.



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