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https://issues.apache.org/jira/browse/HADOOP-7444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13064680#comment-13064680
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Hudson commented on HADOOP-7444:
--------------------------------
Integrated in Hadoop-Common-trunk-Commit #688 (See
[https://builds.apache.org/job/Hadoop-Common-trunk-Commit/688/])
HADOOP-7444. Add Checksum API to verify and calculate checksums "in bulk".
Contributed by Todd Lipcon.
todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1146111
Files :
* /hadoop/common/trunk/common/CHANGES.txt
*
/hadoop/common/trunk/common/src/test/core/org/apache/hadoop/util/TestDataChecksum.java
* /hadoop/common/trunk/common/src/java/org/apache/hadoop/util/DataChecksum.java
> Add Checksum API to verify and calculate checksums "in bulk"
> ------------------------------------------------------------
>
> Key: HADOOP-7444
> URL: https://issues.apache.org/jira/browse/HADOOP-7444
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: 0.23.0
>
> Attachments: hadoop-7444.txt, hadoop-7444.txt, hadoop-7444.txt
>
>
> Currently, the various checksum types only provide the capability to
> calculate the checksum of a range of a byte array. For HDFS-2080, it's
> advantageous to provide an API that, given a buffer with some number of
> "checksum chunks", can either calculate or verify the checksums of all of the
> chunks. For example, given a 4KB buffer and a 512-byte chunk size, it would
> calculate or verify 8 CRC32s in one call.
> This allows efficient JNI-based checksum implementations since the cost of
> crossing the JNI boundary is amortized across many computations.
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