[
https://issues.apache.org/jira/browse/HDFS-14528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16855947#comment-16855947
]
Brahma Reddy Battula commented on HDFS-14528:
---------------------------------------------
{quote}I'm curious why we get the {{Connection refused}} exception in this
scenario. Do you have any insight?
{quote}
Looks ObserverZKFC might be down.
{quote}On the fix, I'm wondering whether it's better to put the check in
{{ZKFailoverController#doCedeActive}}, handled at the same place as SBN
{quote}
As this will be later phase and failover will fail before this as ZKFC is down(
where observer ZKFC is not mandatory and no need be part of failover).
So,Current fix should be fine where we are skipping observer while yiledling
the election(phase 3 here).
> [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)
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
