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  1. HBase
  2. HBASE-2861

regionserver's logsyncer thread hangs on DFSClient$DFSOutputStream.waitForAckedSeqno

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Details

    • Bug
    • Status: Closed
    • Critical
    • Resolution: Fixed
    • None
    • 0.90.0
    • None
    • None

    Description

      During loads into HBase, we are noticing that a RS is sometimes getting stuck.

      The logSyncer thread:

            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)
      

      A lot of other threads are stuck on:

              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)
      

      Subsequently, trying to disable the table, which in turn attempts to close the region(s), caused internalFlushCache() also to get stuck here:

            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)
      

      I'll attach the full jstack trace soon.

      Attachments

        1. jstack.txt
          192 kB
          Kannan Muthukkaruppan

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            hairong Hairong Kuang
            kannanm Kannan Muthukkaruppan
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              Updated:
              Resolved:

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