Auto-HA: Allow manual failover to be invoked from zkfc.
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Key: HADOOP-8279
URL: https://issues.apache.org/jira/browse/HADOOP-8279
Project: Hadoop Common
Issue Type: Improvement
Components: ha
Affects Versions: Auto Failover (HDFS-3042)
Reporter: Mingjie Lai
Fix For: Auto Failover (HDFS-3042)
HADOOP-8247 introduces a configure flag to prevent potential status
inconsistency between zkfc and namenode, by making auto and manual failover
mutually exclusive.
However, as described in 2.7.2 section of design doc at HDFS-2185, we should
allow manual and auto failover co-exist, by:
- adding some rpc interfaces at zkfc
- manual failover shall be triggered by haadmin, and handled by zkfc if auto
failover is enabled.
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