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https://issues.apache.org/jira/browse/HDFS-14528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16856056#comment-16856056
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Brahma Reddy Battula commented on HDFS-14528:
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if SNN ZKFC is down,then failover will fail(while connecting to another ZKFC)
which can be accepted.. But when SNN ZKFC is not up and obserser ZKFC is down
failover should be success.
> [SBN Read]Failover from Active to Standby Failed
> --------------------------------------------------
>
> Key: HDFS-14528
> URL: https://issues.apache.org/jira/browse/HDFS-14528
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ha
> Reporter: Ravuri Sushma sree
> Assignee: Ravuri Sushma sree
> Priority: Major
> Attachments: ZKFC_issue.patch
>
>
> *Started an HA Cluster with three nodes [ _Active ,Standby ,Observer_ ]*
> *When trying to exectue the failover command from active to standby*
> *._/hdfs haadmin -failover nn1 nn2, below Exception is thrown_*
> Operation failed: Call From X-X-X-X/X-X-X-X to Y-Y-Y-Y:nnnn failed on
> connection exception: java.net.ConnectException: Connection refused; For more
> details see: [http://wiki.apache.org/hadoop/ConnectionRefused]
> at sun.reflect.GeneratedConstructorAccessor7.newInstance(Unknown Source)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
> at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:831)
> at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:755)
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