HA: the FailoverController should check the standby is ready before failing over
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Key: HADOOP-7991
URL: https://issues.apache.org/jira/browse/HADOOP-7991
Project: Hadoop Common
Issue Type: Sub-task
Components: ha
Affects Versions: HA Branch (HDFS-1623)
Reporter: Eli Collins
Assignee: Eli Collins
The FC in preFailoverChecks should check that the target service is ready for
failover (eg in the case of HDFS, that it's not in SM) before failing over to
it. We'll need to provide a force option as well since the standby may not
actually be ready until the failover has been initiated (eg because becoming
active kicks it to check the log and see newly allocated blocks).
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