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  1. Hadoop HDFS
  2. HDFS-7999

FsDatasetImpl#createTemporary sometimes holds the FSDatasetImpl lock for a very long time

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    • Target Version/s:

      Description

      I'm using 2.6.0 and noticed that sometime DN's heartbeat were delayed for very long time, say more than 100 seconds. I get the jstack twice and looks like they are all blocked (at getStorageReport) by dataset lock, and which is held by a thread that is calling createTemporary, which again is blocked to wait earlier incarnation writer to exit.

      The heartbeat thread stack:
      java.lang.Thread.State: BLOCKED (on object monitor)
      at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl.getDfsUsed(FsVolumeImpl.java:152)

      • waiting to lock <0x00000007b01428c0> (a org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl)
        at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.getStorageReports(FsDatasetImpl.java:144)
      • locked <0x00000007b0140ed0> (a java.lang.Object)
        at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.sendHeartBeat(BPServiceActor.java:575)
        at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.offerService(BPServiceActor.java:680)
        at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:850)
        at java.lang.Thread.run(Thread.java:662)

      The DataXceiver thread holds the dataset lock:
      "DataXceiver for client at XXXXX" daemon prio=10 tid=0x00007f14041e6480 nid=0x52bc in Object.wait() [0x00007f11d78f7000]
      java.lang.Thread.State: TIMED_WAITING (on object monitor)
      at java.lang.Object.wait(Native Method)
      at java.lang.Thread.join(Thread.java:1194)
      locked <0x00000007a33b85d8> (a org.apache.hadoop.util.Daemon)
      at org.apache.hadoop.hdfs.server.datanode.ReplicaInPipeline.stopWriter(ReplicaInPipeline.java:183)
      at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.createTemporary(FsDatasetImpl.java:1231)
      locked <0x00000007b01428c0> (a org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl)
      at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.createTemporary(FsDatasetImpl.java:114)
      at org.apache.hadoop.hdfs.server.datanode.BlockReceiver.<init>(BlockReceiver.java:179)
      at org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:615)
      at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:137)
      at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:74)
      at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:235)
      at java.lang.Thread.run(Thread.java:662)

        Attachments

        1. HDFS-7999-branch-2.6.1.txt
          5 kB
          Vinod Kumar Vavilapalli
        2. HDFS-7999-003.patch
          4 kB
          zhouyingchao
        3. HDFS-7999-002.patch
          4 kB
          zhouyingchao
        4. HDFS-7999-001.patch
          4 kB
          zhouyingchao

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              • Assignee:
                sinago zhouyingchao
                Reporter:
                sinago zhouyingchao
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                • Created:
                  Updated:
                  Resolved: