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https://issues.apache.org/jira/browse/HDFS-14528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16856490#comment-16856490
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Ravuri Sushma sree commented on HDFS-14528:
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Thank you everyone for the discussion
[~csun] yes, as you are saying this can be a general issue where without
observer also if any of the standby namenode's zkfc is down we may encounter
the same error.
I shall change the description and add an UT
As per current scenario, observer is not to be included in failover (Observer
to active)and hence this fix is skipping observer in phase 3 .
If multiple standby namenodes are present, with any one of the zkfc of standby
namenode down,it can be skipped here as well ( when encountered connection
refused) will work on it and upload the patch here .Also, will update the
summary and description of this jira with another UT for it accordingly
> [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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