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Posted to hdfs-dev@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2010/12/16 18:59:04 UTC

[jira] Created: (HDFS-1542) Deadlock in Configuration.writeXml when serialized form is larger than one DFS block

Deadlock in Configuration.writeXml when serialized form is larger than one DFS block
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                 Key: HDFS-1542
                 URL: https://issues.apache.org/jira/browse/HDFS-1542
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs client
    Affects Versions: 0.20.2, 0.22.0, 0.23.0
            Reporter: Todd Lipcon
            Priority: Critical
         Attachments: Test.java

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.

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