[jboss-jira] [JBoss JIRA] Created: (JGRP-590) FC: messages > max_credits will block forever

[Bela Ban (JIRA)]

FC: messages > max_credits will block forever
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                 Key: JGRP-590
                 URL: http://jira.jboss.com/jira/browse/JGRP-590
             Project: JGroups
          Issue Type: Task
            Reporter: Bela Ban
         Assigned To: Bela Ban
             Fix For: 2.4.1 SP5, 2.5.1, 2.6


FC.down checks for the message size. If that size is greater than the credits left, we block until we get more credits from the receiver(s). However, if the message size is greater than *max_credits*, we will *never* have more than max_credits available to send the message, so we'd block forever !

To prevent running into this, we need to check (at startup time) in FC that
- a fragmentation protocol is available (somewhere above the FC protocol) 
- that the max fragmentation size of the fragmentation protocol is smaller than max_credits


We should also log a (fatal) error message if we receive a message whose size is greater than max_credits (this should *not* happen anymore though after the proposed change above)

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