[infinispan-issues] [JBoss JIRA] (ISPN-2808) Make Infinispan use its own thread pool for sending messages in order to avoid thread deadlocks

[Radim Vansa (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-2808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12759060#comment-12759060 ] 

Radim Vansa commented on ISPN-2808:
-----------------------------------

The deadlock will eventually time out (after sync.replTimeout) and if the nodes which stopped communicating are not removed from the cluster, the operations may continue. Partial solution is provided in JGRP-1599 so that the node keeps receiving heartbeats. Also, the FD protocols (cluster partition detection) may be disabled - then the nodes are not removed.
                
> Make Infinispan use its own thread pool for sending messages in order to avoid thread deadlocks
> -----------------------------------------------------------------------------------------------
>
>                 Key: ISPN-2808
>                 URL: https://issues.jboss.org/browse/ISPN-2808
>             Project: Infinispan
>          Issue Type: Feature Request
>            Reporter: Mircea Markus
>            Assignee: Pedro Ruivo
>             Fix For: 5.3.0.Beta1, 5.3.0.Final
>
>
> - when an OOB thread sends a sync request it blocks waiting on a sync in jgroups RequestCorrelator 
> - it gets released by an another OOB thread when the remote node responds
> Now if all the OOB threads are blocked in sending, then there's no available OOB thread to unblock them even if responses from remote nodes have arrived - deadlock. In order to avoid this deadlock we can use a different thread pool for sending OOB messages.
> For a discussion around this please refer to: http://infinispan.markmail.org/search/#query:%20list%3Aorg.jboss.lists.infinispan-dev+page:1+mid:7buuwljp7i7fvnpe+state:results 

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