[HBASE-23668] Master log start filling with "Flush journal status" messages

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0-alpha-1, 2.3.0
• Component/s: proc-v2, RegionProcedureStore
• Hadoop Flags: Reviewed
• Assignee: Michael Stack
• Reporter: Michael Stack
• Created: 09/Jan/20 07:27
• Updated: 12/Jan/20 00:07
• Resolved: 10/Jan/20 18:29

Description

Takes a while to get into this condition. Not each to tell how because all logs have rolled off and I only have logs filled w/ below:

2020-01-09 07:01:01,723 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Flush status journal:
	Acquiring readlock on region at 1578553261723
	Flush successful flush result:CANNOT_FLUSH_MEMSTORE_EMPTY, failureReason:Nothing to flush,flush seq id45226854 at 1578553261723
2020-01-09 07:01:01,723 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Flush status journal:
	Acquiring readlock on region at 1578553261723
	Flush successful flush result:CANNOT_FLUSH_MEMSTORE_EMPTY, failureReason:Nothing to flush,flush seq id45226855 at 1578553261723
2020-01-09 07:01:01,723 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Flush status journal:
	Acquiring readlock on region at 1578553261723
	Flush successful flush result:CANNOT_FLUSH_MEMSTORE_EMPTY, failureReason:Nothing to flush,flush seq id45226856 at 1578553261723
2020-01-09 07:01:01,723 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Flush status journal:
	Acquiring readlock on region at 1578553261723
	Flush successful flush result:CANNOT_FLUSH_MEMSTORE_EMPTY, failureReason:Nothing to flush,flush seq id45226857 at 1578553261723

... I added the printing of flushresult... i.e. cannot flush because store is empty.

Digging.

Issue Links

• links to: GitHub Pull Request #1013
• links to: GitHub Pull Request #1015

Sub-Tasks

• Add UT for procedure store region flusher: Resolved