[HBASE-21266] Not running balancer because processing dead regionservers, but empty dead rs list

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.4.8
• Fix Version/s: 3.0.0-alpha-1, 1.3.3, 2.2.0, 2.1.1, 2.0.3, 1.4.9
• Hadoop Flags: Reviewed
• Assignee: Andrew Kyle Purtell
• Reporter: Andrew Kyle Purtell
• Created: 03/Oct/18 19:26
• Updated: 01/Feb/19 20:13
• Resolved: 16/Oct/18 05:29

Description

Found during ITBLL testing. AM in master gets into a state where manual attempts from the shell to run the balancer always return false and this is printed in the master log:

2018-10-03 19:17:14,892 DEBUG [RpcServer.default.FPBQ.Fifo.handler=21,queue=0,port=8100] master.HMaster: Not running balancer because processing dead regionserver(s):

Note the empty list.

This errant state did not recover without intervention by way of master restart, but the test environment was chaotic so needs investigation.

Issue Links

• breaks: HBASE-21380 TestRSGroups failing
• links to: Review Board (branch-2.1)