David Manning created HBASE-28257:
-------------------------------------
Summary: Memstore flushRequest can be blocked by a delayed flush
scheduled by PeriodicMemstoreFlusher, RegionTooBusyExceptions for up to 5
minutes
Key: HBASE-28257
URL: https://issues.apache.org/jira/browse/HBASE-28257
Project: HBase
Issue Type: Bug
Components: regionserver
Affects Versions: 2.0.0, 3.0.0
Reporter: David Manning
Assignee: David Manning
*Steps to reproduce:*
# Make an edit to a region.
# Wait 1 hour (default value of hbase.regionserver.optionalcacheflushinterval.)
# Make a very large number of edits to the region (i.e. >= 1GB, pressure the
memstore.)
*Expected:*
Memstore pressure leads to flushes.
*Result:*
The PeriodicMemstoreFlusher has scheduled a refresh with a random delay of 0-5
minutes (default for
hbase.regionserver.periodicmemstoreflusher.rangeofdelayseconds.) Memstore
pressure flushes are blocked by the scheduled delayed flush. Client receives
0-5 minutes of RegionTooBusyExceptions until the delayed flush executes.
*Logs:*
2023-12-13 06:00:13,573 INFO regionserver.HRegionServer - MemstoreFlusherChore
requesting flush of <REGION> because <CF> has an old edit so flush to free WALs
after random delay 166761 ms
2023-12-13 06:00:53,219 DEBUG regionserver.HRegion - Flush requested on <REGION>
2023-12-13 06:01:47,694 WARN regionserver.HRegion - Region is too busy due to
exceeding memstore size limit. org.apache.hadoop.hbase.RegionTooBusyException:
Over memstore limit=1.0 G, regionName=<REGION>, server=<SERVER>
at org.apache.hadoop.hbase.regionserver.HRegion.checkResources
...
repeats
...
2023-12-13 06:01:52,223 WARN regionserver.HRegion - Region is too busy due to
exceeding memstore size limit. org.apache.hadoop.hbase.RegionTooBusyException:
Over memstore limit=1.0 G, regionName=<REGION>, server=<SERVER>
at org.apache.hadoop.hbase.regionserver.HRegion.checkResources
...
2023-12-13 06:03:00,340 INFO regionserver.HRegion - Flushing <REGION> 1/1
column families, dataSize=534.77 MB heapSize=1.00 GB
2023-12-13 06:03:09,634 INFO regionserver.HRegion - Finished flush of dataSize
~534.77 MB/560744948, heapSize ~1.00 GB/1073816296, currentSize=0 B/0 for
<REGION> in 9294ms, sequenceid=21310753, compaction requested=false
Note also this is the same cause as discussed in HBASE-16030 conversation
https://issues.apache.org/jira/browse/HBASE-16030?focusedCommentId=15340153&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-15340153
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