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https://issues.apache.org/jira/browse/HDFS-1056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12884219#action_12884219
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dhruba borthakur commented on HDFS-1056:
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This fix could impact other code paths too, especially since the DN comparision
is used by many code paths. Maybe a unit test would be good.
also, does this problem exist in trunk?
> Multi-node RPC deadlocks during block recovery
> ----------------------------------------------
>
> Key: HDFS-1056
> URL: https://issues.apache.org/jira/browse/HDFS-1056
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Affects Versions: 0.20.2, 0.21.0, 0.22.0
> Reporter: Todd Lipcon
> Fix For: 0.20-append
>
> Attachments:
> 0013-HDFS-1056.-Fix-possible-multinode-deadlocks-during-b.patch
>
>
> Believe it or not, I'm seeing HADOOP-3657 / HADOOP-3673 in a 5-node 0.20
> cluster. I have many concurrent writes on the cluster, and when I kill a DN,
> some percentage of the time I get one of these cross-node deadlocks among 3
> of the nodes (replication 3). All of the DN RPC server threads are tied up
> waiting on RPC clients to other datanodes.
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