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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4463) ActiveStandbyElector can join election even before Service HEALTHY, and results in null data at ActiveBreadCrumb
Date Mon, 04 Feb 2013 14:38:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13570293#comment-13570293
] 

Hadoop QA commented on HDFS-4463:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12567834/HDFS-4463.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-common-project/hadoop-common.

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

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/3942//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/3942//console

This message is automatically generated.
                
> ActiveStandbyElector can join election even before Service HEALTHY, and results in null
data at ActiveBreadCrumb
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-4463
>                 URL: https://issues.apache.org/jira/browse/HDFS-4463
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: ha
>    Affects Versions: 2.0.2-alpha
>            Reporter: Vinay
>            Assignee: Vinay
>            Priority: Critical
>         Attachments: HDFS-4463.patch
>
>
> ActiveStandbyElector can store null at ActiveBreadCrumb in the below race condition.
At further all failovers will fail resulting NPE.
> 1. ZKFC restarted.
> 2. due to machine busy, first zk connection is expired even before the health monitoring
returned the status.
> 3. On re-establishment transitionToActive will be called, at this time appData will be
null,
> 4. So now ActiveBreadCrumb will have null.
> 5. After this any failovers will fail throwing 
> {noformat}java.lang.NullPointerException
> 	at org.apache.hadoop.util.StringUtils.byteToHexString(StringUtils.java:171)
> 	at org.apache.hadoop.ha.ActiveStandbyElector.fenceOldActive(ActiveStandbyElector.java:892)
> 	at org.apache.hadoop.ha.ActiveStandbyElector.becomeActive(ActiveStandbyElector.java:797)
> 	at org.apache.hadoop.ha.ActiveStandbyElector.processResult(ActiveStandbyElector.java:475)
> 	at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:545)
> 	at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:497){noformat}
> Should not join the election before service is HEALTHY

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