Improve ActiveStandbyElector's behavior when session expires
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Key: HDFS-3151
URL: https://issues.apache.org/jira/browse/HDFS-3151
Project: Hadoop HDFS
Issue Type: Improvement
Affects Versions: 0.24.0, 0.23.3
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Currently when the ZK session expires, it results in a fatal error being sent
to the application callback. This is not the best behavior -- for example, in
the case of HA, if ZK goes down, we would like the current state to be
maintained, rather than causing either NN to abort. When the ZK clients are
able to reconnect, they should sort out the correct leader based on the normal
locking schemes.
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