[jboss-jira] [JBoss JIRA] (JGRP-1815) TP: sending a message to a non-existent physical address takes too much time

[Bela Ban (JIRA)]

Bela Ban created JGRP-1815:
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             Summary: TP: sending a message to a non-existent physical address takes too much time
                 Key: JGRP-1815
                 URL: https://issues.jboss.org/browse/JGRP-1815
             Project: JGroups
          Issue Type: Enhancement
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 3.5


When sending a message in the transport, e.g. a message batch, and one or more destinations have no physical addresses in {{logical_addr_cache}}, then we loop {{physical_addr_max_fetch_attempts}} (default: 3) times and also sleep a random number of ms (in range [1..500]). 
This delays the sending of other messages in the same batch, or of other messages in general. Also, if TransferQueueBundler is used, the transfer queue might get filled, so other sender threads are blocked.
SOLUTION:
* Remove the loop when sending a message: if the physical address for a message is not found, simply send a discovery request and drop the message
* The discovery request needs to be sent on a separate thread, as calling {{up(Event)}} directly could also delay the sending of the message or message batch.
* JGRP-1814 will also help, as connections to left members are closed, and therefore not finding a physical address for a destination should be rare

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