[HBASE-24208] Remove RS entry from zk draining servers node after RS been stopped

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0-alpha-1, 2.4.0
• Hadoop Flags: Reviewed
• Assignee: Gaurav Kanade
• Reporter: Anoop Sam John
• Created: 17/Apr/20 19:24
• Updated: 09/Jun/20 16:23
• Resolved: 08/Jun/20 17:26

Description

When a RS is been decommissioned, we will add an entry into the zk node. This will be there unless the same RS instance is recommissioned.
But if we want to scale down a cluster, the best path would be to decommission the RSs in the scaling down nodes. The regions in these RSs will get moved to live RSs. In this case these decommissioned RSs will get stopped later. These will never get recommissioned. The zk nodes will still be there under draining servers path.
We can remove this zk node when the RS is getting stopped.

Issue Links

• links to: GitHub Pull Request #1841