[HBASE-17071] Do not initialize MemstoreChunkPool when use mslab option is turned off

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.0.0
• Hadoop Flags: Reviewed
• Assignee: Anoop Sam John
• Reporter: Anoop Sam John
• Created: 11/Nov/16 05:14
• Updated: 14/Nov/16 21:09
• Resolved: 11/Nov/16 11:15

Description

This is a 2.0 only issue and induced by HBASE-16407.
We are initializing MSLAB chunk pool along with RS start itself now. (To pass it as a HeapMemoryTuneObserver).
When MSLAB is turned off (ie. hbase.hregion.memstore.mslab.enabled is configured false) we should not be initializing MSLAB chunk pool at all. By default the initial chunk count to be created will be 0 only. Still better to avoid.