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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7444) Add Checksum API to verify and calculate checksums "in bulk"
Date Wed, 06 Jul 2011 06:04:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13060311#comment-13060311
] 

Hadoop QA commented on HADOOP-7444:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12485374/hadoop-7444.txt
  against trunk revision 1143219.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 2 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 system test framework.  The patch passed system test framework compile.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/698//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HADOOP-Build/698//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/698//console

This message is automatically generated.

> 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
>         Attachments: 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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