[HADOOP-8279] Auto-HA: Allow manual failover to be invoked from zkfc.

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Auto Failover (HDFS-3042)
• Fix Version/s: Auto Failover (HDFS-3042)
• Component/s: auto-failover, ha
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Mingjie Lai
• Created: 13/Apr/12 23:52
• Updated: 03/May/12 02:00
• Resolved: 03/May/12 02:00

Description

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.

Issue Links

• is part of: HDFS-3042 Automatic failover support for NN HA