[
https://issues.apache.org/jira/browse/HDFS-2949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13999019#comment-13999019
]
Hudson commented on HDFS-2949:
------------------------------
SUCCESS: Integrated in Hadoop-trunk-Commit #5605 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/5605/])
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.
--
This message was sent by Atlassian JIRA
(v6.2#6252)
