Improve ActiveStandbyElector to provide hooks for fencing old active
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Key: HADOOP-8163
URL: https://issues.apache.org/jira/browse/HADOOP-8163
Project: Hadoop Common
Issue Type: Improvement
Components: ha
Affects Versions: 0.24.0, 0.23.3
Reporter: Todd Lipcon
Assignee: Todd Lipcon
When a new node becomes active in an HA setup, it may sometimes have to take
fencing actions against the node that was formerly active. This JIRA extends
the ActiveStandbyElector which adds an extra non-ephemeral node into the ZK
directory, which acts as a second copy of the active node's information. Then,
if the active loses its ZK session, the next active to be elected may easily
locate the unfenced node to take the appropriate actions.
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