[HBASE-19261] ClusterStatusPublisher where Master could optionally broadcast notice of dead servers is broke

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: MTTR
• Assignee: Unassigned
• Reporter: Michael Stack
• Created: 15/Nov/17 06:12
• Updated: 15/Nov/17 21:15

Description

An old feature that you could optionally enable so Master would broadcast via UDP/Multicast messages to registered clients when it learned of dead servers is broken in hbase2. It was added here:

commit c352a848a1af318df4f0348728fb136ce289d3e4
Author: nkeywal <nkeywal@unknown>
Date: Tue Mar 19 10:07:17 2013 +0000

HBASE-7590 Add a costless notifications mechanism from master to regionservers & clients - new files

It could help the recalibration of clients on server death run quicker. I have not stats on how often it was use if at all.

I tried playing around with it to try and get it going again but need to spend more time on it. Putting aside for now.

We should make it work again and then talk it up as a mechanism that can help improve MTTR (or strip it).