Auto-HA: add a config to enable auto-HA, which disables manual FC
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Key: HADOOP-8247
URL: https://issues.apache.org/jira/browse/HADOOP-8247
Project: Hadoop Common
Issue Type: Improvement
Components: auto-failover, ha
Affects Versions: Auto Failover (HDFS-3042)
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Currently, if automatic failover is set up and running, and the user uses the
"haadmin -failover" command, he or she can end up putting the system in an
inconsistent state, where the state in ZK disagrees with the actual state of
the world. To fix this, we should add a config flag which is used to enable
auto-HA. When this flag is set, we should disallow use of the haadmin command
to initiate failovers. We should refuse to run ZKFCs when the flag is not set.
Of course, this flag should be scoped by nameservice.
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