[HADOOP-7788] HA: Simple HealthMonitor class to watch an HAService

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.24.0
• Fix Version/s: 0.23.4
• Component/s: ha
• Target Version/s: 0.24.0
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 01/Nov/11 01:42
• Updated: 16/Mar/15 20:14
• Resolved: 20/Mar/12 23:30

Description

This is a utility class which will be part of the FailoverController. The class starts a daemon thread which periodically monitors an HAService, calling its monitorHealth function. It then generates callbacks into another class when the health status changes (eg the RPC fails or the service returns a HealthCheckFailedException)

Issue Links

• blocks: HDFS-3042 Automatic failover support for NN HA