[HBASE-21200] Memstore flush doesn't finish because of seekToPreviousRow() in memstore scanner. - ASF JIRA

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Details

Type: Bug
Status: Resolved
Priority: Critical
Resolution: Fixed
Affects Version/s: None
Fix Version/s: 3.0.0-alpha-1, 2.2.0, 2.1.1, 2.0.3
Component/s: Scanners
Labels:
None

Description

The issue of delaying memstore flush still occurs after backport hbase-15871.

Reverse scan takes a long time to seek previous row in the memstore full of deleted cells.

jstack :

"MemStoreFlusher.0" #114 prio=5 os_prio=0 tid=0x00007fa3d0729000 nid=0x486a waiting on condition [0x00007fa3b9b6b000]
   java.lang.Thread.State: WAITING (parking)
        at sun.misc.Unsafe.park(Native Method)
        - parking to wait for <0x00000000a465fe60> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
        at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:870)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199)
        at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:209)
        at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285)
        at org.apache.hadoop.hbase.regionserver.StoreScanner.updateReaders(StoreScanner.java:695)
        at org.apache.hadoop.hbase.regionserver.HStore.notifyChangedReadersObservers(HStore.java:1127)
        at org.apache.hadoop.hbase.regionserver.HStore.updateStorefiles(HStore.java:1106)
        at org.apache.hadoop.hbase.regionserver.HStore.access$600(HStore.java:130)
        at org.apache.hadoop.hbase.regionserver.HStore$StoreFlusherImpl.commit(HStore.java:2455)
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushCacheAndCommit(HRegion.java:2519)
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2256)
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2218)
        at org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:2110)
        at org.apache.hadoop.hbase.regionserver.HRegion.flush(HRegion.java:2036)
        at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:501)
        at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:471)
        at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.access$800(MemStoreFlusher.java:75)
        at org.apache.hadoop.hbase.regionserver.MemStoreFlusher$FlushHandler.run(MemStoreFlusher.java:259)
        at java.lang.Thread.run(Thread.java:748)

"RpcServer.FifoWFPBQ.default.handler=27,queue=0,port=16020" #65 daemon prio=5 os_prio=0 tid=0x00007fa3e6280000 nid=0x4801 runnable [0x00007fa3bd29a000]
   java.lang.Thread.State: RUNNABLE
        at org.apache.hadoop.hbase.regionserver.DefaultMemStore$MemStoreScanner.getNext(DefaultMemStore.java:780)
        at org.apache.hadoop.hbase.regionserver.DefaultMemStore$MemStoreScanner.seekInSubLists(DefaultMemStore.java:826)
        - locked <0x00000000b45aa5b8> (a org.apache.hadoop.hbase.regionserver.DefaultMemStore$MemStoreScanner)
        at org.apache.hadoop.hbase.regionserver.DefaultMemStore$MemStoreScanner.seek(DefaultMemStore.java:818)
        - locked <0x00000000b45aa5b8> (a org.apache.hadoop.hbase.regionserver.DefaultMemStore$MemStoreScanner)
        at org.apache.hadoop.hbase.regionserver.DefaultMemStore$MemStoreScanner.seekToPreviousRow(DefaultMemStore.java:1000)
        - locked <0x00000000b45aa5b8> (a org.apache.hadoop.hbase.regionserver.DefaultMemStore$MemStoreScanner)
        at org.apache.hadoop.hbase.regionserver.ReversedKeyValueHeap.next(ReversedKeyValueHeap.java:136)
        at org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:629)
        at org.apache.hadoop.hbase.regionserver.KeyValueHeap.next(KeyValueHeap.java:147)
        at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.populateResult(HRegion.java:5876)
        at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextInternal(HRegion.java:6027)
        at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:5814)
        at org.apache.hadoop.hbase.regionserver.RSRpcServices.scan(RSRpcServices.java:2552)
        - locked <0x000000009ee8ca10> (a org.apache.hadoop.hbase.regionserver.ReversedRegionScannerImpl)
        at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:32385)
        at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2150)
        at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:112)
        at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:187)
        at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:167)