[jboss-jira] [JBoss JIRA] (JGRP-1844) Remove shared transport

[Bela Ban (JIRA)]

Bela Ban created JGRP-1844:
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             Summary: Remove shared transport
                 Key: JGRP-1844
                 URL: https://issues.jboss.org/browse/JGRP-1844
             Project: JGroups
          Issue Type: Task
            Reporter: Bela Ban
            Assignee: Bela Ban


I'm thinking of deprecating the shared transport [1] and remove it in 4.0. The replacement would be fork channels [2].

Here's my reasoning:
* Shared transports are quite a complex beast: initialization (ref counting), cluster-name and local-addr are not used in TP when shared, duplicate logic. Removing this will make the code base smaller
* All protocols *above* shared transports are not shared, e.g. FD_SOCK, NAKACK, UNICAST etc all maintain their own threads, retransmission tables, sockets etc. With fork channels, everything up to the FORK protocol *is* shared
* TUNNEL doesn't work with shared transports (throws an exception)
* Hidden insertion of TP$ProtocolAdapter into the stack when shared transports are used
* Unneeded cost of sending N-1 messages (e.g. with TCP). Currently we send a message with dest null and no IP multicast capable transport to all physical addresses in the transport, which is a waste

Thoughts ? My +100 for removing shared transports in 4.0...


[1] http://www.jgroups.org/manual/html/user-advanced.html#SharedTransport
[2] http://www.jgroups.org/manual/html/user-advanced.html#ForkChannel 



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