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https://issues.apache.org/jira/browse/HBASE-28494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17902225#comment-17902225
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ZhongYou Li edited comment on HBASE-28494 at 12/2/24 10:09 AM:
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I also encountered a similar problem, my HDFS is healthy, and I restarted the
RegionServer and it returned to normal. I suspect there is a bug here. Even if
HDFS is abnormal, it should not be stuck for a long time.
was (Author: JIRAUSER305814):
I also encountered a similar problem. My HDFS is healthy, and it returns to
normal when I restart the RegionServer. I suspect there is a bug here.
> "WAL system stuck?" due to threads hang at
> org.apache.hadoop.hbase.regionserver.MultiVersionConcurrencyControl.complete
> -----------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-28494
> URL: https://issues.apache.org/jira/browse/HBASE-28494
> Project: HBase
> Issue Type: Bug
> Components: regionserver, wal
> Affects Versions: 2.5.5
> Environment: hbase-2.5.5
> hadoop-3.3.6
> kerberos authentication enabled.
> OS: debian 11
> Reporter: Athish Babu
> Priority: Major
> Attachments: RS_thread_dump.txt
>
>
> Currently we come across a issue in write handler threads of a regionserver
> during AsyncFSWAL append operation. We could see regionserver's write handler
> threads is going to WAITING State while acquiring lock for WAL append
> operation at MultiVersionConcurrencyControl.begin
>
> {code:java}
> "RpcServer.default.FPRWQ.Fifo.write.handler=7,queue=3,port=16020" #133 daemon
> prio=5 os_prio=0 tid=0x00007f9301fe7800 nid=0x329a02 runnable
> [0x00007f8a6489a000]
> java.lang.Thread.State: TIMED_WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:338)
> at
> com.lmax.disruptor.MultiProducerSequencer.next(MultiProducerSequencer.java:136)
> at
> com.lmax.disruptor.MultiProducerSequencer.next(MultiProducerSequencer.java:105)
> at com.lmax.disruptor.RingBuffer.next(RingBuffer.java:263)
> at
> org.apache.hadoop.hbase.regionserver.wal.AbstractFSWAL.lambda$stampSequenceIdAndPublishToRingBuffer$10(AbstractFSWAL.java:1202)
> at
> org.apache.hadoop.hbase.regionserver.wal.AbstractFSWAL$$Lambda$631/875615795.run(Unknown
> Source)
> at
> org.apache.hadoop.hbase.regionserver.MultiVersionConcurrencyControl.begin(MultiVersionConcurrencyControl.java:144)
> - locked <0x00007f8afa4d1a80> (a java.util.LinkedList)
> at
> org.apache.hadoop.hbase.regionserver.wal.AbstractFSWAL.stampSequenceIdAndPublishToRingBuffer(AbstractFSWAL.java:1201)
> at
> org.apache.hadoop.hbase.regionserver.wal.AsyncFSWAL.append(AsyncFSWAL.java:647)
> at
> org.apache.hadoop.hbase.regionserver.wal.AbstractFSWAL.lambda$appendData$14(AbstractFSWAL.java:1255)
> at
> org.apache.hadoop.hbase.regionserver.wal.AbstractFSWAL$$Lambda$699/1762709833.call(Unknown
> Source)
> at org.apache.hadoop.hbase.trace.TraceUtil.trace(TraceUtil.java:216)
> at
> org.apache.hadoop.hbase.regionserver.wal.AbstractFSWAL.appendData(AbstractFSWAL.java:1255)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.doWALAppend(HRegion.java:7800)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.doMiniBatchMutate(HRegion.java:4522)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.batchMutate(HRegion.java:4446)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.batchMutate(HRegion.java:4368)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.doBatchOp(RSRpcServices.java:1033)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.doNonAtomicBatchOp(RSRpcServices.java:951)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.doNonAtomicRegionMutation(RSRpcServices.java:916)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.multi(RSRpcServices.java:2892)
> at
> org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:45008)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:415)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:124)
> at org.apache.hadoop.hbase.ipc.RpcHandler.run(RpcHandler.java:102)
> at org.apache.hadoop.hbase.ipc.RpcHandler.run(RpcHandler.java:82) {code}
>
> Other write handler threads are getting BLOCKED state while waiting for above
> lock to get released.
>
> {code:java}
> "RpcServer.default.FPRWQ.Fifo.write.handler=38,queue=2,port=16020" #164
> daemon prio=5 os_prio=0 tid=0x00007f9303147800 nid=0x329a21 waiting for
> monitor entry [0x00007f8a61586000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> org.apache.hadoop.hbase.regionserver.MultiVersionConcurrencyControl.complete(MultiVersionConcurrencyControl.java:179)
> - waiting to lock <0x00007f8afa4d1a80> (a java.util.LinkedList)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.doWALAppend(HRegion.java:7808)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.doMiniBatchMutate(HRegion.java:4522)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.batchMutate(HRegion.java:4446)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.batchMutate(HRegion.java:4368)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.doBatchOp(RSRpcServices.java:1033)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.doNonAtomicBatchOp(RSRpcServices.java:951)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.doNonAtomicRegionMutation(RSRpcServices.java:916)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.multi(RSRpcServices.java:2892)
> at
> org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:45008)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:415)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:124)
> at org.apache.hadoop.hbase.ipc.RpcHandler.run(RpcHandler.java:102)
> at org.apache.hadoop.hbase.ipc.RpcHandler.run(RpcHandler.java:82){code}
> Due to above occurence , WAL system getting stucked and facing
> callqueueTooBig Exception
> {code:java}
> ERROR [MemStoreFlusher.0] o.a.h.h.r.MemStoreFlusher - Cache flush failed for
> region
> analytics:RawData,DIO|DISK_USAGE_STATS,1710357005367.55ec1db85903bbf9d2588b6d60b7b66f.
> org.apache.hadoop.hbase.exceptions.TimeoutIOException: Failed to get sync
> result after 300000 ms for txid=5472571, WAL system stuck?
> at
> org.apache.hadoop.hbase.regionserver.wal.SyncFuture.get(SyncFuture.java:171)
> ~[hbase-server-2.5.5.jar:2.5.5]
> at
> org.apache.hadoop.hbase.regionserver.wal.AbstractFSWAL.blockOnSync(AbstractFSWAL.java:869)
> ~[hbase-server-2.5.5.jar:2.5.5]
> at
> org.apache.hadoop.hbase.regionserver.wal.AsyncFSWAL.doSync(AsyncFSWAL.java:668)
> ~[hbase-server-2.5.5.jar:2.5.5]
> at
> org.apache.hadoop.hbase.regionserver.wal.AbstractFSWAL.lambda$sync$1(AbstractFSWAL.java:590)
> ~[hbase-server-2.5.5.jar:2.5.5]
> at org.apache.hadoop.hbase.trace.TraceUtil.trace(TraceUtil.java:187)
> ~[hbase-common-2.5.5.jar:2.5.5]
> at
> org.apache.hadoop.hbase.regionserver.wal.AbstractFSWAL.sync(AbstractFSWAL.java:590)
> ~[hbase-server-2.5.5.jar:2.5.5]
> at
> org.apache.hadoop.hbase.regionserver.wal.AbstractFSWAL.sync(AbstractFSWAL.java:580)
> ~[hbase-server-2.5.5.jar:2.5.5]
> at
> org.apache.hadoop.hbase.regionserver.HRegion.doSyncOfUnflushedWALChanges(HRegion.java:2779)
> ~[hbase-server-2.5.5.jar:2.5.5]
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalPrepareFlushCache(HRegion.java:2721)
> ~[hbase-server-2.5.5.jar:2.5.5]
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2580)
> ~[hbase-server-2.5.5.jar:2.5.5]
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2554)
> ~[hbase-server-2.5.5.jar:2.5.5]
> at
> org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:2424)
> ~[hbase-server-2.5.5.jar:2.5.5]
> at
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:603)
> [hbase-server-2.5.5.jar:2.5.5]
> at
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:572)
> [hbase-server-2.5.5.jar:2.5.5]
> at
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.access$1000(MemStoreFlusher.java:65)
> [hbase-server-2.5.5.jar:2.5.5]
> at
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher$FlushHandler.run(MemStoreFlusher.java:344)
> [hbase-server-2.5.5.jar:2.5.5] {code}
> Issue get fixed in above mentioned regionserver after restarting the process.
> But after sometime again same issue occurs in other regionserver.
>
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