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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2949) HA: Add check to active state transition to prevent operator-induced split brain
Date Tue, 20 May 2014 15:38:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14003474#comment-14003474
] 

Hudson commented on HDFS-2949:
------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk #1780 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1780/])
HDFS-2949. Add check to active state transition to prevent operator-induced split brain. Contributed
by Rushabh S Shah. (kihwal: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1594709)
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/HAAdmin.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNode.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSHAAdmin.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/TestDFSHAAdmin.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/TestDFSHAAdminMiniCluster.java


> 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
>             Fix For: 3.0.0, 2.5.0
>
>         Attachments: HDFS-2949-v2.patch, HDFS-2949-v3.patch, 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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