HA: if both NNs are in Standby mode, client needs to try failing back and forth
several times with sleeps
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Key: HADOOP-7896
URL: https://issues.apache.org/jira/browse/HADOOP-7896
Project: Hadoop Common
Issue Type: Sub-task
Components: ipc
Affects Versions: HA Branch (HDFS-1623)
Reporter: Todd Lipcon
Assignee: Aaron T. Myers
Priority: Critical
For a manual failover, there may be an intermediate state for a non-trivial
amount of time where both NNs are in standby mode. Currently, the failover
proxy will immediately failover on receiving this exception from the first NN,
and when it hits the same exception on the second NN, it immediately fails. It
should probably fail back and forth nearly indefinitely if both NNs are in
Standby mode.
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