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

[Mircea Markus (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-2808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12756131#comment-12756131 ] 

Mircea Markus commented on ISPN-2808:
-------------------------------------

JGroups 3.3.0 added the async invocation API that should be in order to achieve this.
A new thread pool should be defined in the global section for this purpose and shared between threads (asyncRequestExecutor).
This thread pool would handle both OOB and regular requests and should be used for commands that (potentially) perform long computations e.g. PrepareCommand might block 10(default for acquiring locks or CommitCommand that might flush the L1 caches(RPC) synchronously.
Other commands (e.g. TxCompletionNotification) can be processed in the OOB thread as this is guaranteed short lived operation.


                
> 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.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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