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From "Eric Periard (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (AMBARI-15235) Display tag for StandBy name node should not be changed to NameNode if there is an active namenode
Date Mon, 11 Jul 2016 13:29:11 GMT

    [ https://issues.apache.org/jira/browse/AMBARI-15235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15370744#comment-15370744
] 

Eric Periard edited comment on AMBARI-15235 at 7/11/16 1:28 PM:
----------------------------------------------------------------

I've been running ambari 2.2.2.0 for two weeks now, whenever nn fails snn kicks in as active
and nn becomes standby.

Ambari still reports both NN's as Active even though the back-end is fine when checking with
HAadmin command....


was (Author: eric.periard@ccirc-ccric.ca):
I've been running ambari 2.2.2.0 for two weeks now, whenever nn fails snn kicks in as active
and nn becomes standby.

Ambari still reports both NN's as Active even though the back is fine when checking with HAadmin
command....

> Display tag for StandBy name node should not be changed to NameNode if there is an active
namenode
> --------------------------------------------------------------------------------------------------
>
>                 Key: AMBARI-15235
>                 URL: https://issues.apache.org/jira/browse/AMBARI-15235
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-web
>    Affects Versions: 2.2.0
>            Reporter: Jaimin D Jetly
>            Assignee: Jaimin D Jetly
>            Priority: Critical
>             Fix For: 2.2.2
>
>         Attachments: AMBARI-15235.patch
>
>
> On a large cluster with heavy load on NameNode, sometimes there happens to be greater
latency for Standby NameNode in responding back its JMX metrics which results in timeout for
the JMX call dome by ambari-server and no JMX data for standby NameNode is received sometimes.
> Thus Standby NameNode in such environment responses sometimes by declaring itself standby
and sometimes doesn't respond quick enough before timeout happens.
> Due to this behavior ambari-web keeps alternating frequently between “standby namenode”
and “namenode”, even though there is no failover.
> As a fix ambari if detects any one namenode to be active should consider other to be
standby even though JMX call to standby namenode has timedout.



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