[jboss-jira] [JBoss JIRA] (JGRP-1528) RELAY2: batch messages forwarded to remote sites

[Mircea Markus (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-1528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12729108#comment-12729108 ] 

Mircea Markus commented on JGRP-1528:
-------------------------------------

How would this fit with sync replication calls?
I guess they might still block for the batching duration, which I I guess would be much smaller than (max_forward_attempts * forward_sleep milliseconds), i.e. would be in x * 100-millisecond timeout.
Also API wise, do you plan to return a future or ISPN-2423 is still relevant even when this will be in place?
 
                
> RELAY2: batch messages forwarded to remote sites
> ------------------------------------------------
>
>                 Key: JGRP-1528
>                 URL: https://issues.jboss.org/browse/JGRP-1528
>             Project: JGroups
>          Issue Type: Feature Request
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 3.3
>
>
> If a site is down, then forwarding a message to it will block the thread (actually: wait) for max_forward_attempts * forward_sleep milliseconds.
> If we have many incoming messages (from the local site) to be forwarded to the remote site, then having every thread sleep for (say) 10 seconds will increase the thread pool.
> We should therefore add *batching* to RELAY2; messages to be forwarded are queued until a certain time has elapsed or the accumulated total size of all queued messages exceeds a certain threshold.
> Incoming messages to be forwarded would be added to the queue (allowing the sending thread to be returned to the thread pool). A separate thread (or task) would monitor the queue and do the forwarding, and it would also notice that a site is down and send unreachable messages back to the original senders.

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