[HBASE-2342] Consider adding a watchdog node next to region server

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Component/s: regionserver
• Assignee: Unassigned
• Reporter: Todd Lipcon
• Created: 17/Mar/10 23:29
• Updated: 11/Jun/22 23:20
• Resolved: 30/Oct/12 22:20

Description

This idea has been bandied about a fair amount. The concept is to add a second java process that runs next to each region server to act as a watchdog. Several possible purposes:

• monitor the RS for liveness - if it exhibits Juliet syndrome ("appears dead") then we kill it agressively to prevent it from coming back to life
• restart RS automatically in failure cases
• potentially move the entire ZK session to the watchdog to decouple node liveness from the particular JVM liveness

Let's discuss in this JIRA.