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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4552) Deadlock in RPC Server
Date Tue, 11 Nov 2008 02:07:44 GMT

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

Raghu Angadi updated HADOOP-4552:

    Attachment: deadlock-example.txt

The thread stack that Aaron sent. Note that "Thread 9" and "Thread 37" block each other.

Regd locking on Selectors, please read the small section "Concurrency" on Java doc for Selectors
: http://java.sun.com/javase/6/docs/api/java/nio/channels/Selector.html

> 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
>             Fix For: 0.19.1, 0.20.0
>         Attachments: deadlock-example.txt, 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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