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  1. Hadoop HDFS
  2. HDFS-7060

Avoid taking locks when sending heartbeats from the DataNode

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    • Hadoop Flags:
      Reviewed

      Description

      We're seeing the heartbeat is blocked by the monitor of FsDatasetImpl when the DN is under heavy load of writes:

         java.lang.Thread.State: BLOCKED (on object monitor)
              at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl.getDfsUsed(FsVolumeImpl.java:115)
              - waiting to lock <0x0000000780304fb8> (a org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl)
              at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.getStorageReports(FsDatasetImpl.java:91)
              - locked <0x0000000780612fd8> (a java.lang.Object)
              at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.sendHeartBeat(BPServiceActor.java:563)
              at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.offerService(BPServiceActor.java:668)
              at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:827)
              at java.lang.Thread.run(Thread.java:744)
      
         java.lang.Thread.State: BLOCKED (on object monitor)
              at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.createRbw(FsDatasetImpl.java:743)
              - waiting to lock <0x0000000780304fb8> (a org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl)
              at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.createRbw(FsDatasetImpl.java:60)
              at org.apache.hadoop.hdfs.server.datanode.BlockReceiver.<init>(BlockReceiver.java:169)
              at org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:621)
              at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:124)
              at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:71)
              at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:232)
              at java.lang.Thread.run(Thread.java:744)
      
         java.lang.Thread.State: RUNNABLE
              at java.io.UnixFileSystem.createFileExclusively(Native Method)
              at java.io.File.createNewFile(File.java:1006)
              at org.apache.hadoop.hdfs.server.datanode.DatanodeUtil.createTmpFile(DatanodeUtil.java:59)
              at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.BlockPoolSlice.createRbwFile(BlockPoolSlice.java:244)
              at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl.createRbwFile(FsVolumeImpl.java:195)
              at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.createRbw(FsDatasetImpl.java:753)
              - locked <0x0000000780304fb8> (a org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl)
              at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.createRbw(FsDatasetImpl.java:60)
              at org.apache.hadoop.hdfs.server.datanode.BlockReceiver.<init>(BlockReceiver.java:169)
              at org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:621)
              at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:124)
              at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:71)
              at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:232)
              at java.lang.Thread.run(Thread.java:744)
      

        Attachments

        1. HDFS-7060.000.patch
          4 kB
          Haohui Mai
        2. HDFS-7060.001.patch
          5 kB
          Xinwei Qin
        3. HDFS-7060-002.patch
          4 kB
          Brahma Reddy Battula
        4. complete_failed_qps.png
          42 kB
          Jiandan Yang
        5. sendHeartbeat.png
          87 kB
          Jiandan Yang
        6. HDFS-7060.003.patch
          6 kB
          Jiandan Yang
        7. HDFS-7060.004.patch
          6 kB
          Weiwei Yang
        8. HDFS-7060.005.patch
          6 kB
          Weiwei Yang
        9. HDFS Status Post Patch.png
          72 kB
          Weiwei Yang

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              • Assignee:
                yangjiandan Jiandan Yang
                Reporter:
                wheat9 Haohui Mai
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                Dates

                • Created:
                  Updated:
                  Resolved: