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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4597) Under-replicated blocks are not calculated if the name-node is forced out of safe-mode.
Date Thu, 06 Nov 2008 23:03:48 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12645612#action_12645612
] 

Hadoop QA commented on HADOOP-4597:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12393414/NeededRepl.patch
  against trunk revision 711734.

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

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

    +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 warnings.

    +1 Eclipse classpath. The patch retains Eclipse classpath integrity.

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

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

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3543/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3543/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3543/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3543/console

This message is automatically generated.

> Under-replicated blocks are not calculated if the name-node is forced out of safe-mode.
> ---------------------------------------------------------------------------------------
>
>                 Key: HADOOP-4597
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4597
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.18.0
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>            Priority: Blocker
>             Fix For: 0.18.3
>
>         Attachments: NeededRepl-18.patch, NeededRepl.patch
>
>
> Currently during name-node startup under-replicated blocks are not added to the neededReplications
queue until the name-node leaves safe mode. This is an optimization since otherwise all blocks
will first go into the under-replicated queue and then most of them will be removed from it.
> When the name-node leaves safe-mode automatically it checks all blocks to have a correct
number of replicas ({{processMisReplicatedBlocks()}}). 
> When the name-node leaves safe-mode manually it does not perform the checkup.
> In the latter case all under-replicated blocks remain not replicated forever because
there is no alternative mechanism to trigger replications.
> The proposal is to call {{processMisReplicatedBlocks()}} any time the name-node leaves
safe mode - automatically or manually.
> In addition to solving that problem this could be an alternative mechanism for refreshing
{{neededReplications}} and {{excessReplicateMap}} sets.

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