Duo Zhang created HBASE-19812:
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Summary: TestFlushSnapshotFromClient fails because of failing
region.flush
Key: HBASE-19812
URL: https://issues.apache.org/jira/browse/HBASE-19812
Project: HBase
Issue Type: Bug
Environment: {noformat}
2018-01-17 06:43:48,390 INFO [MemStoreFlusher.1] regionserver.HRegion(2516):
Flushing 1/1 column families, memstore=549.25 KB
2018-01-17 06:43:48,390 DEBUG [MemStoreFlusher.1]
regionserver.CompactingMemStore(205): FLUSHING TO DISK: region
test,5,1516171425662.acafc22e1f8132285eae5362d0df536a.store: fam
2018-01-17 06:43:48,406 DEBUG
[RpcServer.default.FPBQ.Fifo.handler=4,queue=0,port=42601-inmemoryCompactions-1516171428312]
regionserver.CompactionPipeline(206): Compaction pipeline segment
Type=CSLMImmutableSegment, empty=no, cellCount=17576, cellSize=562432,
totalHeapSize=1828120, min timestamp=1516171428258, max
timestamp=1516171428258Num uniques -1; flattened
2018-01-17 06:43:48,406 DEBUG [MemStoreFlusher.1]
regionserver.CompactionPipeline(128): Swapping pipeline suffix; before=1, new
segement=null
2018-01-17 06:43:48,455 DEBUG [Time-limited test] regionserver.HRegion(2201):
NOT flushing memstore for region
test,5,1516171425662.acafc22e1f8132285eae5362d0df536a., flushing=true,
writesEnabled=true
{noformat}
You can see that we start a background flush first, and then we decided to do
an in memory compaction, at the same time we call the region.flush from test,
and it find that the region is already flushing so it give up.
This test is a bit awkward that we create the table with 6 regions which start
key is 0,1,2,3,4,5, but when loading data we use 'aaa' to 'zzz', so there is
only one region has data. And in the above scenario the only one region gives
up flushing, then there is no data, and then our test fails.
Reporter: Duo Zhang
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