[
https://issues.jboss.org/browse/JGRP-1317?page=com.atlassian.jira.plugin....
]
Bela Ban commented on JGRP-1317:
--------------------------------
To reduce memory consumption even more, we could only store the view and HD/HR seqno pairs
in Digest:
{noformat}
View view;
long[] seqnos;
{noformat}
The view is stored when a digest is created. The seqnos contains the seqno pairs, e.g.
20:20, 15:20, 0:0 in the example above.
This already has benefits for JoinRsp and MergeData (and others): both have a View and a
Digest field. The Digest.view would simply point to the view field. Digest.view would have
to be set when a Digest is unmarshalled, e.g. received over the network. The advantage is
that we're storing the membership list only *once*.
Also, in STABLE, if we make Digest.view refer to the current view, then we can have as
many digests as we want, but the membership is stored only once.
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: 3.4
For large clusters, STABLE messages are quite large, and should be compressed to be sent
over the wire.
STABLE messages are sent between members in the same view, so we could only send the
ViewId + highest_delivered/highest_received seqnos.
Everybody who receives a STABLE message grabs the View associated with the ViewId (should
be the current view !) and creates a Digest based on the View and the long[] array.
Further optimization:
- 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 !
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see:
http://www.atlassian.com/software/jira