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From "Nicolas Spiegelberg (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-1056) Multi-node RPC deadlocks during block recovery
Date Thu, 24 Jun 2010 20:11:09 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1056?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nicolas Spiegelberg updated HDFS-1056:
--------------------------------------

    Attachment: 0013-HDFS-1056.-Fix-possible-multinode-deadlocks-during-b.patch

added Todd's fix for 0.20-append.  no unit test yet

> 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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