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https://issues.apache.org/jira/browse/HADOOP-10545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13984610#comment-13984610
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Sebastien Barrier commented on HADOOP-10545:
--------------------------------------------
To reproduce take 3 servers (server1,server2,server3)
- server1 and server2 are namenodes
- server1, server2, server3 are zookeeper servers
- server1 and server2 are zkfc
but if you run hdfs zkfc on server3 it will result of NullPointerException.
configuration sample :
<property>
<name>dfs.nameservices</name>
<value>mycluster</value>
</property>
<property>
<name>dfs.ha.namenodes.mycluster</name>
<value>server1,server2</value>
</property>
<property>
<name>dfs.namenode.rpc-address.mycluster.server1</name>
<value>server1:8020</value>
</property>
<property>
<name>dfs.namenode.rpc-address.mycluster.server2</name>
<value>server2:8020</value>
</property>
> hdfs zkfc NullPointerException
> ------------------------------
>
> Key: HADOOP-10545
> URL: https://issues.apache.org/jira/browse/HADOOP-10545
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.4.0
> Environment: Linux
> Reporter: Sebastien Barrier
> Priority: Minor
>
> Running hdfs zkfc on a node which is not a Namenode result of
> NullPointerException.
> An error message should be displayed telling that zkfc must be run only on a
> Namenode server and/or to verify configuration parameters.
> # hdfs zkfc -formatZK
> Exception in thread "main" java.lang.NullPointerException
> at
> com.google.common.base.Preconditions.checkNotNull(Preconditions.java:187)
> at
> org.apache.hadoop.hdfs.tools.NNHAServiceTarget.<init>(NNHAServiceTarget.java:57)
> at
> org.apache.hadoop.hdfs.tools.DFSZKFailoverController.create(DFSZKFailoverController.java:128)
> at
> org.apache.hadoop.hdfs.tools.DFSZKFailoverController.main(DFSZKFailoverController.java:172)
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