[jboss-jira] [JBoss JIRA] Reopened: (JGRP-1317) STABLE: compress STABLE messages

STABLE: compress STABLE messages -------------------------------- Key: JGRP-1317 URL: https://issues.jboss.org/browse/JGRP-1317 Project: JGroups Issue Type: Feature Request Reporter: Bela Ban Assignee: Bela Ban Fix For: 2.12.2, 3.0 For large clusters, stable messages are quite large, and should be compressed. E.g.: - Don't send the entire view (with all members), but only the ViewId, then the indices of a digest array would point to the rank of a member within the referred-to ViewId - A digest has 3 longs (low, highest_received and highest_delivered). Do we need all 3 every time ? - Compress the 3 longs into 1 long and 2 shorts: the latter 2 are offsets from the first seqno - Use a bit set (consisting of a variable number of ints) to set the 3 variables - If we have a digest (0), 0, 0: send a special marker - Canonicalize digests: if everyone has (14) 20, 22, then we could write it once, give it an ID of (say) 1 and then only refer to 1 again if we encounter the same digest. Actually, as a matter of fact, most of the digests would be the same, so this optimization could have a big effect !