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

[Bela Ban (JIRA)]

STABLE: compress STABLE messages
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                 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, 3.1


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 !


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