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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4462) 2NN will fail to checkpoint after an HDFS upgrade from a pre-federation version of HDFS
Date Fri, 01 Feb 2013 08:15:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13568560#comment-13568560
] 

Hadoop QA commented on HDFS-4462:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12567534/HDFS-4462.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 3 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/3934//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/3934//console

This message is automatically generated.
                
> 2NN will fail to checkpoint after an HDFS upgrade from a pre-federation version of HDFS
> ---------------------------------------------------------------------------------------
>
>                 Key: HDFS-4462
>                 URL: https://issues.apache.org/jira/browse/HDFS-4462
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.0.2-alpha
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>         Attachments: HDFS-4462.patch, HDFS-4462.patch
>
>
> The 2NN currently has logic to detect when its on-disk FS metadata needs an upgrade with
respect to the NN's metadata (i.e. the layout versions are different) and in this case it
will proceed with the checkpoint despite storage signatures not matching precisely if the
BP ID and Cluster ID do match exactly. However, in situations where we're upgrading from versions
of HDFS prior to federation, which had no BP IDs or Cluster IDs, checkpoints will always fail
with an error like the following:
> {noformat}
> 13/01/31 17:02:25 ERROR namenode.SecondaryNameNode: checkpoint: Inconsistent checkpoint
fields.
> LV = -40 namespaceID = 403832480 cTime = 1359680537192 ; clusterId = CID-0df6ff22-1165-4c7d-9630-429972a7737c
; blockpoolId = BP-1520616013-172.21.3.106-1359680537136.
> Expecting respectively: -19; 403832480; 0; ; .
> {noformat}

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