regionserver's logsyncer thread hangs on
DFSClient$DFSOutputStream.waitForAckedSeqno
------------------------------------------------------------------------------------
Key: HBASE-2861
URL: https://issues.apache.org/jira/browse/HBASE-2861
Project: HBase
Issue Type: Bug
Reporter: Kannan Muthukkaruppan
Priority: Blocker
During loads into HBase, we are noticing that a RS is sometimes getting stuck.
The logSyncer thread:
{code}
at
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.waitForAckedSeqno(DFSClient.java:3367)
- locked <0x00002aaac7fef748> (a java.util.LinkedList)
at
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.sync(DFSClient.java:3301)
at
org.apache.hadoop.fs.FSDataOutputStream.sync(FSDataOutputStream.java:97)
at
org.apache.hadoop.io.SequenceFile$Writer.syncFs(SequenceFile.java:944)
at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogWriter.sync(SequenceFileLogWriter.java:124)
at org.apache.hadoop.hbase.regionserver.wal.HLog.hflush(HLog.java:949)
{code}
A lot of other threads are stuck on:
{code}
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
at
org.apache.hadoop.hbase.regionserver.wal.HLog$LogSyncer.addToSyncQueue(HLog.java:916)
at org.apache.hadoop.hbase.regionserver.wal.HLog.sync(HLog.java:936)
at org.apache.hadoop.hbase.regionserver.wal.HLog.append(HLog.java:828)
at org.apache.hadoop.hbase.regionserver.HRegion.put(HRegion.java:1657)
at org.apache.hadoop.hbase.regionserver.HRegion.put(HRegion.java:1425)
at org.apache.hadoop.hbase.regionserver.HRegion.put(HRegion.java:1393)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.put(HRegionServer.java:1665)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.multiPut(HRegionServer.java:2326)
{code}
Subsequently, trying to disable the table, which in turn attempts to close the
region(s), caused internalFlushCache() also to get stuck here:
{code}
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1114)
at
java.util.concurrent.locks.ReentrantReadWriteLock$WriteLock.lock(ReentrantReadWriteLock.java:807)
at
org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:974)
at org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:511)
- locked <0x00002aaab76af670> (a java.lang.Object)
at org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:463)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.closeRegion(HRegionServer.java:1468)
at
org.apache.hadoop.hbase.regionserver.HRegionServer$Worker.run(HRegionServer.java:1329)
{code}
I'll attach the full jstack trace soon.
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