[jboss-jira] [JBoss JIRA] Commented: (JGRP-1135) UNICAST: add piggybacking of acks

[Bela Ban (JIRA)]

    [ https://jira.jboss.org/jira/browse/JGRP-1135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12514186#action_12514186 ] 

Bela Ban commented on JGRP-1135:
--------------------------------

Might be moot if JGRP-1140 (UNICAST with negative acks) is implemented...

> UNICAST: add piggybacking of acks
> ---------------------------------
>
>                 Key: JGRP-1135
>                 URL: https://jira.jboss.org/jira/browse/JGRP-1135
>             Project: JGroups
>          Issue Type: Feature Request
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 2.10
>
>
> For 2 sync RPCs between A and B, we have the following message exchange:
> 1: A --> DATA(15) --> B  // A sends the first request to B
> 2: A <-- ACK(15) <-- B     // B acks the request
> 3: A <-- DATA(27) <-- B   // B sends the response to A
> 4: A --> ACK(27) --> B    // A acks the response
> 5: A --> DATA(16) --> B  // A sends the second request to B
> 6: A <-- ACK(16) <-- B     // B acks the request
> 7: A <-- DATA(28) <-- B   // B sends the response to A
> 8: A --> ACK(28) --> B    // A acks the response
> If we piggybacked acks, this would look as follows:
> 1: A --> DATA(15) --> B  // A sends the first request to B
> 2: A <-- DATA-ACK(27,15) <-- B   // B sends the response to A and acks A's request
> 3: A --> DATA(16,27) --> B  // A sends the second request to B and acks B's response
> 4: A <-- DATA(28,16) <-- B   // B sends the response to A and acks A's request
> 5: A --> ACK(28) --> B    // A acks the response
> So instead of 8 exchanges, we have 5. Note, however, that *message bundling* might mitigate this somewhat and not send 8 requests ! This needs to be investigated further.

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