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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4552) Deadlock in RPC Server
Date Thu, 30 Oct 2008 22:16:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4552?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Raghu Angadi updated HADOOP-4552:

    Attachment: HADOOP-4552.patch

The attached patch removes timeout processing out of lock around low level selector keys.
The purging loop is executed only once in few minutes and extra iteration is ok.

> Deadlock in RPC Server
> ----------------------
>                 Key: HADOOP-4552
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4552
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: ipc
>    Affects Versions: 0.16.3
>            Reporter: Raghu Angadi
>            Assignee: Raghu Angadi
>         Attachments: HADOOP-4552.patch
> RPC server could get into a deadlock especially when clients or server are network starved.
This is a deadlock between RPC responder thread trying to check if there are any connection
to be purged and RPC handler trying to queue a response to be written by the responder.
> This was first observed [this thread|http://www.nabble.com/TaskTrackers-disengaging-from-JobTracker-to20234317.html].

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