[jboss-jira] [JBoss JIRA] (JGRP-1564) TP: handling of message batches

[Bela Ban (JIRA)]

Bela Ban created JGRP-1564:
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             Summary: TP: handling of message batches
                 Key: JGRP-1564
                 URL: https://issues.jboss.org/browse/JGRP-1564
             Project: JGroups
          Issue Type: Enhancement
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 3.3


When B receives a batch of 5 messages from A (unicast or multicast), then B uses the *same thread* to send the 5 messages up (this isn't the case for OOB messages).

It would be more efficient to either have different threads passing the 5 messages up, or use a new *message batch event type* to pass all 5 messages up in one go.

The advantage of different threads is that all 5 threads add their message to the window, but only 1 removes them and passes them up, rather than each thread adding and removing its own message.

We could try moving the unmarshalling of messages and message batches into TP.receive(). If a batch was received, that code could unmarshal the 5 messages and pass them to corresponding thread pools to send them up.

The unmarshalling shouldn't take long, so TP.receive() should return quickly.
This approach would allow us to send OOB messages in message batches, too (currently not allowed).

The advantage of a message batch is that we pass *one* event up the stack, passing only *once* through all protocols from TP to UNICAST{2} / NAKACK{2}, and not 5 times. Also, adding 5 messages to the window under the same lock is more eficient than acquiring the lock 5 times. Ditto for removal.

The disadvantage is that we now need to handle a different event type (all protocols under UNICAST/NAKACK), e.g. ENCRYPT etc.

Also, this solution is not symmetric, ie. messages are batched at the transport level, and should be unbatched at the transport level of the receiver(s) as well...

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