[ http://jira.jboss.com/jira/browse/JGRP-8?page=history ]
Bela Ban updated JGRP-8:
------------------------
Fix Version: 2.2.9
(was: 2.2.8)
> RpcDispatcher timeouts for nested distributed calls
> ---------------------------------------------------
>
> Key: JGRP-8
> URL: http://jira.jboss.com/jira/browse/JGRP-8
> Project: JGroups
> Type: Bug
> Reporter: Bela Ban
> Assignee: Bela Ban
> Fix For: 2.2.9
>
> Original Estimate: 1 week
> Remaining: 1 week
>
> The unit test is Deadlock2Test
> A sequence of two nested distributed calls on
> RpcDispatcher deadlocks and then timeouts.
> The test setup consists of two RpcDispatchers A and B,
> each dispatcher being able to handle innerMethod() and
> outerMethod(). innerMethod() is simple (just a
> System.out.println(), for example). outerMethod()
> internally calls innerMethod() as a group RPC:
> public void innerMethod() {
> System.out.println("innerMethod()");
> }
> public void outerMethod() {
> rpcDispatcher.callRemoteMethods(null,
> new
> MethodCall("innerMethod", new Object[0]),
> GroupRequest.GET_ALL,
> 60000);
> }
> From A, I callRemoteMethod(B, "outerMethod"). The
> following things happen:
> A
> B
> callRemoteMethod(B, "outerMethod")
> outerMethod() executes
> outerMethod() calls innerMethod() on group
> the
> group call never returns but by timeout
> innerMethod() executes
> .....
> innerMethod() group call timeouts after 60000
> The bottom-most cause of the problem is the fact that
> MessageDispatcher uses only one thread
> ("MessageDispatcher up processing thread") to handle
> incoming RPC requests and to make nested calls. Once a
> nested call is made, the thread blocks on a mutex and
> never gets woken up to handle the response to the
> nested calls, not unless the timeout expires.
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