[HDFS-2185] HA: HDFS portion of ZK-based FailoverController

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.23.3, 2.0.0-alpha
• Fix Version/s: Auto failover (HDFS-3042)
• Component/s: auto-failover, ha
• Target Version/s: Auto failover (HDFS-3042)
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Eli Collins
• Created: 22/Jul/11 07:24
• Updated: 10/Mar/15 04:36
• Resolved: 03/Apr/12 01:00

Description

This jira is for a ZK-based FailoverController daemon. The FailoverController is a separate daemon from the NN that does the following:

• Initiates leader election (via ZK) when necessary
• Performs health monitoring (aka failure detection)
• Performs fail-over (standby to active and active to standby transitions)
• Heartbeats to ensure the liveness

It should have the same/similar interface as the Linux HA RM to aid pluggability.

Issue Links

• depends upon: HADOOP-8206 Common portion of ZK-based failover controller
• incorporates: HADOOP-7992 Add ZK client for leader election
• is related to: HADOOP-7455 Introduce HA Service Protocol Interface