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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2949) HA: Add check to active state transition to prevent operator-induced split brain
Date Sat, 26 Apr 2014 02:20:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13981847#comment-13981847
] 

Hadoop QA commented on HDFS-2949:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12642029/HDFS-2949.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}.  There were no new javadoc 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-common-project/hadoop-common
hadoop-hdfs-project/hadoop-hdfs:

                  org.apache.hadoop.hdfs.tools.TestDFSHAAdmin

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

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/6744//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/6744//console

This message is automatically generated.

> HA: Add check to active state transition to prevent operator-induced split brain
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-2949
>                 URL: https://issues.apache.org/jira/browse/HDFS-2949
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: ha, namenode
>    Affects Versions: 0.24.0
>            Reporter: Todd Lipcon
>            Assignee: Rushabh S Shah
>         Attachments: HDFS-2949.patch
>
>
> Currently, if the administrator mistakenly calls "-transitionToActive" on one NN while
the other one is still active, all hell will break loose. We can add a simple check by having
the NN make a getServiceState() RPC to its peer with a short (~1 second?) timeout. If the
RPC succeeds and indicates the other node is active, it should refuse to enter active mode.
If the RPC fails or indicates standby, it can proceed.
> This is just meant as a preventative safety check - we still expect users to use the
"-failover" command which has other checks plus fencing built in.



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