ZKFailoverController doesn't handle failure to become active correctly
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Key: HADOOP-8220
URL: https://issues.apache.org/jira/browse/HADOOP-8220
Project: Hadoop Common
Issue Type: Bug
Components: ha
Affects Versions: 0.23.3, 0.24.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Priority: Critical
The ZKFC doesn't properly handle the case where the monitored service fails to
become active. Currently, it catches the exception and logs a warning, but then
continues on, after calling quitElection(). This causes a NPE when it later
tries to use the same zkClient instance while handling that same request. There
is a test case, but the test case doesn't ensure that the node that had the
failure is later able to recover properly.
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