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  1. Hadoop HDFS
  2. HDFS-1542

Deadlock in Configuration.writeXml when serialized form is larger than one DFS block

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Details

    • Bug
    • Status: Closed
    • Critical
    • Resolution: Fixed
    • 0.22.0, 0.23.0
    • 0.22.0
    • hdfs-client
    • None
    • Reviewed

    Description

      Configuration.writeXml holds a lock on itself and then writes the XML to an output stream, during which DFSOutputStream will try to get a lock on ackQueue/dataQueue. Meanwihle the DataStreamer thread will call functions like conf.getInt() and deadlock against the other thread, since it could be the same conf object.

      This causes a deterministic deadlock whenever the serialized form is larger than block size.

      Attachments

        1. Test.java
          0.5 kB
          Todd Lipcon
        2. hdfs-1542.txt
          6 kB
          Todd Lipcon
        3. hdfs-1542.txt
          6 kB
          Todd Lipcon
        4. hdfs-1542.txt
          6 kB
          Todd Lipcon
        5. hdfs-1542.txt
          2 kB
          Todd Lipcon
        6. hdfs1542_cdh3b3.txt
          1 kB
          Amit Nithian
        7. deadlock.txt
          82 kB
          Amit Nithian

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              tlipcon Todd Lipcon
              tlipcon Todd Lipcon
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              Dates

                Created:
                Updated:
                Resolved: