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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3007) DataNode pipelining : failure on mirror results in failure on upstream datanode
Date Fri, 21 Mar 2008 04:33:24 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12580998#action_12580998
] 

Hadoop QA commented on HADOOP-3007:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
http://issues.apache.org/jira/secure/attachment/12378264/HADOOP-3007.patch
against trunk revision 619744.

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

    tests included -1.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no tests are needed for this patch.

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

    javac +1.  The applied patch does not generate any new javac compiler warnings.

    release audit +1.  The applied patch does not generate any new release audit warnings.

    findbugs +1.  The patch does not introduce any new Findbugs warnings.

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

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

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2017/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2017/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2017/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2017/console

This message is automatically generated.

> DataNode pipelining : failure on mirror results in failure on upstream datanode
> -------------------------------------------------------------------------------
>
>                 Key: HADOOP-3007
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3007
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.16.0
>            Reporter: Raghu Angadi
>            Assignee: Raghu Angadi
>            Priority: Blocker
>             Fix For: 0.16.2
>
>         Attachments: HADOOP-3007.patch, HADOOP-3007.patch
>
>
> When datanode is transfering data to other datanodes (as opposed to a client write()),
DN currently receiving the data is supposed to continued to receive even if the downstream
(mirror) datanode fails.
> I think there are two minor bugs in receiveBlock() :
> # mirrorSock masks this.mirrorSock, which could be set to null by other members like
receiveChunk() to indicate failure.
> # when this.mirrorSock is non null, failure to write to it at in receiveBlock() should
be handled same way as in receiveChunk().
> I am not sure if this should block 0.16.1, but should surely block 0.16.2.

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