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https://issues.apache.org/jira/browse/HDFS-1542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12973764#action_12973764
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Peter Voss commented on HDFS-1542:
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Hi Todd,
please note that in Amit's case the configuration is just 50K (when serialized
to xml), which means that this deadlock doesn't only happen when the conf size
is greater than the block size.
> Deadlock in Configuration.writeXml when serialized form is larger than one
> DFS block
> ------------------------------------------------------------------------------------
>
> 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: deadlock.txt, 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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