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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3004) Implement Recovery Mode
Date Thu, 05 Apr 2012 01:13:19 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13246919#comment-13246919
] 

Hadoop QA commented on HDFS-3004:
---------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12521415/HDFS-3004.038.patch
  against trunk revision .

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

    +1 tests included.  The patch appears to include 21 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 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +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 passed unit tests in .

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

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/2187//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/2187//console

This message is automatically generated.
                
> Implement Recovery Mode
> -----------------------
>
>                 Key: HDFS-3004
>                 URL: https://issues.apache.org/jira/browse/HDFS-3004
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: tools
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-3004.010.patch, HDFS-3004.011.patch, HDFS-3004.012.patch, HDFS-3004.013.patch,
HDFS-3004.015.patch, HDFS-3004.016.patch, HDFS-3004.017.patch, HDFS-3004.018.patch, HDFS-3004.019.patch,
HDFS-3004.020.patch, HDFS-3004.022.patch, HDFS-3004.023.patch, HDFS-3004.024.patch, HDFS-3004.026.patch,
HDFS-3004.027.patch, HDFS-3004.029.patch, HDFS-3004.030.patch, HDFS-3004.031.patch, HDFS-3004.032.patch,
HDFS-3004.033.patch, HDFS-3004.034.patch, HDFS-3004.035.patch, HDFS-3004.036.patch, HDFS-3004.037.patch,
HDFS-3004.038.patch, HDFS-3004__namenode_recovery_tool.txt
>
>
> When the NameNode metadata is corrupt for some reason, we want to be able to fix it.
 Obviously, we would prefer never to get in this case.  In a perfect world, we never would.
 However, bad data on disk can happen from time to time, because of hardware errors or misconfigurations.
 In the past we have had to correct it manually, which is time-consuming and which can result
in downtime.
> Recovery mode is initialized by the system administrator.  When the NameNode starts up
in Recovery Mode, it will try to load the FSImage file, apply all the edits from the edits
log, and then write out a new image.  Then it will shut down.
> Unlike in the normal startup process, the recovery mode startup process will be interactive.
 When the NameNode finds something that is inconsistent, it will prompt the operator as to
what it should do.   The operator can also choose to take the first option for all prompts
by starting up with the '-f' flag, or typing 'a' at one of the prompts.
> I have reused as much code as possible from the NameNode in this tool.  Hopefully, the
effort that was spent developing this will also make the NameNode editLog and image processing
even more robust than it already is.

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