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

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: 3.x 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.