hadoop-common-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7444) Add Checksum API to verify and calculate checksums "in bulk"
Date Thu, 14 Jul 2011 11:15:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13065181#comment-13065181
] 

Hudson commented on HADOOP-7444:
--------------------------------

Integrated in Hadoop-Common-trunk #746 (See [https://builds.apache.org/job/Hadoop-Common-trunk/746/])
    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.

--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

Mime
View raw message