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https://issues.apache.org/jira/browse/HDFS-14961?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ayush Saxena updated HDFS-14961:
--------------------------------
Description:
HDFS-14130 made ZKFC aware of the Observer Namenode and hence allows ZKFC
running along with the observer NOde.
The Observer namenode isn't suppose to be part of ZKFC election process.
But if the Namenode was part of election, before turning into Observer by
transitionToObserver Command. The ZKFC still sends instruction to the Namenode
as a result of previous participation and sometimes tend to change the state of
Observer to Standby.
This is also the reason for failure in TestDFSZKFailoverController.
TestDFSZKFailoverController has been consistently failing with a time out
waiting in testManualFailoverWithDFSHAAdmin(). In particular
{{waitForHAState(1, HAServiceState.OBSERVER);}}.
was:
TestDFSZKFailoverController has been consistently failing with a time out
waiting in testManualFailoverWithDFSHAAdmin(). In particular
{{waitForHAState(1, HAServiceState.OBSERVER);}}.
> Prevent ZKFC changing Observer Namenode state
> ---------------------------------------------
>
> Key: HDFS-14961
> URL: https://issues.apache.org/jira/browse/HDFS-14961
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Íñigo Goiri
> Assignee: Ayush Saxena
> Priority: Major
> Attachments: HDFS-14961-01.patch, HDFS-14961-02.patch
>
>
> HDFS-14130 made ZKFC aware of the Observer Namenode and hence allows ZKFC
> running along with the observer NOde.
> The Observer namenode isn't suppose to be part of ZKFC election process.
> But if the Namenode was part of election, before turning into Observer by
> transitionToObserver Command. The ZKFC still sends instruction to the
> Namenode as a result of previous participation and sometimes tend to change
> the state of Observer to Standby.
> This is also the reason for failure in TestDFSZKFailoverController.
> TestDFSZKFailoverController has been consistently failing with a time out
> waiting in testManualFailoverWithDFSHAAdmin(). In particular
> {{waitForHAState(1, HAServiceState.OBSERVER);}}.
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