[HDFS-2354] Generalize the HAServiceProtocol interface

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Not A Problem
• Component/s: ha, namenode
• Assignee: Justin Joseph
• Reporter: Justin Joseph
• Created: 21/Sep/11 14:35
• Updated: 24/Jan/12 08:43
• Resolved: 24/Jan/12 08:43

Description

This JIRA intends to revisit the patches committed for HADOOP-7455 and HDFS-1974 & to provide more generic interfaces which allows alternative HA implementations to co-exist complying with HAServiceProtocol.

Some of the considerations are
1) Support life cycle methods (start*() and stop() APIs) in HAServiceProtocol
2) Support custom states in HAServiceProtocol
3) As per the patch submitted for HDFS-1974, Namenode implements HAService interface. This needs to be reconsidered.

I will elaborate on these points, in the form of comments below.

Issue Links

• relates to: HADOOP-7455 Introduce HA Service Protocol Interface
• relates to: HDFS-1974 HA: Introduce active and standby states to the namenode