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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5159) Secondary NameNode fails to checkpoint if error occurs downloading edits on first checkpoint
Date Wed, 04 Sep 2013 06:04:52 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13757486#comment-13757486
] 

Hadoop QA commented on HDFS-5159:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12601318/HDFS-5159.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-hdfs-project/hadoop-hdfs.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/4925//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/4925//console

This message is automatically generated.
                
> Secondary NameNode fails to checkpoint if error occurs downloading edits on first checkpoint
> --------------------------------------------------------------------------------------------
>
>                 Key: HDFS-5159
>                 URL: https://issues.apache.org/jira/browse/HDFS-5159
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.1.0-beta
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>         Attachments: HDFS-5159.patch
>
>
> The 2NN will avoid downloading/loading a new fsimage if its local copy of fsimage is
the same as the version on the NN. However, the decision to *load* the fsimage from disk into
memory is based only on the on-disk fsimage version. If an error occurs between downloading
and loading the fsimage on the first checkpoint attempt, the 2NN will never load the fsimage,
and then on subsequent checkpoint attempts it will not load the on-disk fsimage and thus will
never checkpoint successfully.
> Example error message in the first comment of this ticket.

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