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Date: Wed, 6 Apr 2011 08:08:06 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-1606) Provide a stronger data guarantee in
 the write pipeline
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    [ https://issues.apache.org/jira/browse/HDFS-1606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13016297#comment-13016297 ] 

Hadoop QA commented on HDFS-1606:
---------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12475554/h1606_20110405b.patch
  against trunk revision 1087900.

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

    +1 tests included.  The patch appears to include 6 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 failed these core unit tests:
                  org.apache.hadoop.hdfs.server.datanode.TestBlockReport
                  org.apache.hadoop.hdfs.TestFileAppend2
                  org.apache.hadoop.hdfs.TestFileAppend4
                  org.apache.hadoop.hdfs.TestLargeBlock
                  org.apache.hadoop.hdfs.TestMultiThreadedHflush
                  org.apache.hadoop.hdfs.TestWriteConfigurationToDFS

    -1 contrib tests.  The patch failed contrib unit tests.

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

Test results: https://hudson.apache.org/hudson/job/PreCommit-HDFS-Build/319//testReport/
Findbugs warnings: https://hudson.apache.org/hudson/job/PreCommit-HDFS-Build/319//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://hudson.apache.org/hudson/job/PreCommit-HDFS-Build/319//console

This message is automatically generated.

> Provide a stronger data guarantee in the write pipeline
> -------------------------------------------------------
>
>                 Key: HDFS-1606
>                 URL: https://issues.apache.org/jira/browse/HDFS-1606
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: data-node, hdfs client, name-node
>    Affects Versions: 0.23.0
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>             Fix For: 0.23.0
>
>         Attachments: h1606_20110210.patch, h1606_20110211.patch, h1606_20110217.patch, h1606_20110228.patch, h1606_20110404.patch, h1606_20110405.patch, h1606_20110405b.patch
>
>
> In the current design, if there is a datanode/network failure in the write pipeline, DFSClient will try to remove the failed datanode from the pipeline and then continue writing with the remaining datanodes.  As a result, the number of datanodes in the pipeline is decreased.  Unfortunately, it is possible that DFSClient may incorrectly remove a healthy datanode but leave the failed datanode in the pipeline because failure detection may be inaccurate under erroneous conditions.
> We propose to have a new mechanism for adding new datanodes to the pipeline in order to provide a stronger data guarantee.

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