[jboss-jira] [JBoss JIRA] (JGRP-1630) RpcDispatcher : exclusion list failure

[Karim AMMOUS (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-1630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12779687#comment-12779687 ] 

Karim AMMOUS commented on JGRP-1630:
------------------------------------

Hi Bela,

The test program is somewhat strange, but it is a real-life scenario encountered in prod environment.
If local_addr is null, discarding message or passing it up are both risky decision.
Of course, it would be perfect if after initialization, local_addr is not null. If it's unavoidable, we could imagine a post initialization treatment that check/detect problem and fix it on the fixer.
                
> RpcDispatcher : exclusion list failure
> --------------------------------------
>
>                 Key: JGRP-1630
>                 URL: https://issues.jboss.org/browse/JGRP-1630
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 3.3
>            Reporter: Karim AMMOUS
>            Assignee: Bela Ban
>             Fix For: 3.4
>
>         Attachments: RpcDispTest.java
>
>
> The usage of exclusion list during RPC call is not thread safe. In some conditions, requests are executed on excluded members. 
> Please find enclosed a program that reproduce the reported problem.
> h5. Program scenario:
> First statements create a permanent opened channel with an RpcDispacher.
> The remaining represents a loop that creates a channel with an RpcDispatcher, makes an RPC call where exclusion list contains the caller and finally disconnects the channel.
> The program stops when the request is handled on the caller. Few iterations are needed to reach it
> h5. Observation:
> At the called side, the exclusion list is checked by the RequestCorrelator ([instruction here|https://github.com/belaban/JGroups/blob/3.3/src/org/jgroups/blocks/RequestCorrelator.java#L356]). 
> The condition that supposed ignore request fails because RequestCorrelator has a null local_addr

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