[HBASE-15128] Disable region splits and merges switch in master

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.3.0, 2.0.0
• Labels: reviewed
• Assignee: Heng Chen
• Reporter: Enis Soztutar
• Created: 19/Jan/16 02:55
• Updated: 16/May/19 05:01
• Resolved: 29/Feb/16 13:19

Description

In large clusters where region splits are frequent, and HBCK runs take longer, the concurrent splits cause further problems in HBCK since HBCK assumes a static state for the region partition map. We have just seen a case where HBCK undo's a concurrently splitting region causing number of inconsistencies to go up.

We can have a mode in master where splits and merges are disabled like the balancer and catalog janitor switches. Master will reject the split requests if regionservers decide to split. This switch can be turned on / off by the admins and also automatically by HBCK while it is running (similar to balancer switch being disabled by HBCK).

HBCK should also disable the Catalog Janitor just in case.

Issue Links

• breaks: HBASE-15406 Split / merge switch left disabled after early termination of hbck
• relates to: HBASE-22426 Disable region split/merge switch doen't work when 'hbase.assignment.usezk' is set true
• relates to: HBASE-17942 Disable region splits and merges per table
• links to: ReviewBoard