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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6934) Move checksum computation off the hot path when writing to RAM disk
Date Sun, 26 Oct 2014 08:29:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14184428#comment-14184428
] 

Hadoop QA commented on HDFS-6934:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12677153/HDFS-6934.5.patch
  against trunk revision 65d95b1.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 4 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-common-project/hadoop-common
hadoop-hdfs-project/hadoop-hdfs.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/8543//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/8543//console

This message is automatically generated.

> Move checksum computation off the hot path when writing to RAM disk
> -------------------------------------------------------------------
>
>                 Key: HDFS-6934
>                 URL: https://issues.apache.org/jira/browse/HDFS-6934
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>            Reporter: Arpit Agarwal
>            Assignee: Chris Nauroth
>         Attachments: HDFS-6934.3.patch, HDFS-6934.4.patch, HDFS-6934.5.patch, h6934_20141003b.patch,
h6934_20141005.patch
>
>
> Since local RAM is considered reliable we can avoid writing checksums on the hot path
when replicas are being written to a local RAM disk.
> The checksum can be computed by the lazy writer when moving replicas to disk.



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