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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4591) HA clients can fail to fail over while Standby NN is performing long checkpoint
Date Tue, 12 Mar 2013 07:47:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13599804#comment-13599804
] 

Hadoop QA commented on HDFS-4591:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12573268/HDFS-4591.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 2 new or modified
test files.

    {color:green}+1 tests included appear to have a timeout.{color}

    {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:red}-1 core tests{color}.  The patch failed these unit tests in hadoop-hdfs-project/hadoop-hdfs:

                  org.apache.hadoop.hdfs.server.datanode.TestDataDirs

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

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/4085//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/4085//console

This message is automatically generated.
                
> HA clients can fail to fail over while Standby NN is performing long checkpoint
> -------------------------------------------------------------------------------
>
>                 Key: HDFS-4591
>                 URL: https://issues.apache.org/jira/browse/HDFS-4591
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: ha, namenode
>    Affects Versions: 2.0.4-alpha
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>         Attachments: HDFS-4591.patch, HDFS-4591.patch
>
>
> Clients know to fail over to talk to the Active NN when they perform an RPC to the Standby
NN and it throws a StandbyException. However, most places in the code that check if the NN
is in the standby state do so inside the FSNS fsLock. Since this lock is held for the duration
of the saveNamespace during a checkpoint, StandbyExceptions will not be thrown during this
time.

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