[HDFS-14961] [SBN read] Prevent ZKFC changing Observer Namenode state - ASF JIRA

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Details

Type: Bug
Status: Resolved
Priority: Major
Resolution: Fixed
Affects Version/s: None
Fix Version/s: 3.3.0
Component/s: None
Labels:
None

Hadoop Flags:

Reviewed

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);.