dongjin2193.jeon created HBASE-21200: ----------------------------------------
Summary: Memstore flush doesn't finish because of seekToPreviousRow() in memstore scanner. Key: HBASE-21200 URL: https://issues.apache.org/jira/browse/HBASE-21200 Project: HBase Issue Type: Bug Components: Scanners Reporter: dongjin2193.jeon 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) -- This message was sent by Atlassian JIRA (v7.6.3#76005)