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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3002) HDFS should not remove blocks while in safemode.
Date Tue, 08 Jul 2008 22:24:31 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12611830#action_12611830

Hadoop QA commented on HADOOP-3002:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 674932.

    +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 release audit.  The applied patch does not increase the total number of release audit

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

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

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2816/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2816/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2816/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2816/console

This message is automatically generated.

> HDFS should not remove blocks while in safemode.
> ------------------------------------------------
>                 Key: HADOOP-3002
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3002
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.16.0
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>            Priority: Blocker
>             Fix For: 0.17.2, 0.18.0
>         Attachments: DelBlocksInSafeMode-018.patch, DelBlocksInSafeMode.patch, DelBlocksInSafeMode.patch
> I noticed that data-nodes are removing blocks during a rather prolonged distributed upgrade
when the name-node is in safe mode.
> This happened on my experimental cluster with accelerated block report rate.
> By definition in safe mode the name-node should not
> - accept client requests to change the namespace state, and
> - schedule block replications and/or block removal for the data-nodes.
> We don't want any unnecessary replications until all blocks are reported during startup.
> We also don't want to remove blocks if safe mode is entered manually.
> In heartbeat processing we explicitly verify that the name-node is in safe-mode and do
not return any block commands to the data-nodes.
> Block reports can also return block commands, which should be banned during safe mode.

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