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From "Ayush Saxena (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14528) Failover from Active to Standby Failed
Date Tue, 10 Sep 2019 20:40:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16926881#comment-16926881
] 

Ayush Saxena commented on HDFS-14528:
-------------------------------------

On a cursory view, the patch looks good.

minor nit:
correct the javadoc 

{code:java}
+  /**
+   * Test that manual failover is successful with Observernode.
+   */
{code}
In the test you are not  using observer, but standby...


> 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: HDFS-14528.003.patch, HDFS-14528.004.patch, HDFS-14528.2.Patch,
ZKFC_issue.patch
>
>
>  *In a cluster with more than one Standby namenode, manual failover throws exception
for some cases*
> *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
> This is encountered in the following cases :
>  Scenario 1 : 
> Namenodes - NN1(Active) , NN2(Standby), NN3(Standby)
> When trying to manually failover from NN1 to NN2 if NN3 is down, Exception is thrown
> Scenario 2 :
>  Namenodes - NN1(Active) , NN2(Standby), NN3(Standby)
> ZKFC's -              ZKFC1,            ZKFC2,            ZKFC3
> When trying to manually failover using NN1 to NN3 if NN3's ZKFC (ZKFC3) is down, Exception
is thrown



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