[infinispan-dev] JGRP-1317 and large clusters

[Bela Ban]

FYI,


if you're running large clusters, you might be interested to know that I 
implemented another optimization: JGRP-1317 [1].

The effect of it is that (in decreasing order of importance):

- Regular view messages to existing members don't carry a digest any 
longer. This is a significant size reduction, as a digest has 2 longs 
per member (although compressed for network transmission)

- Where we have a view and a digest (e.g. JoinRsp, merge response, 
MergeView), the digest's 'members' field and the view's 'members' field 
point to the same memory location

- When we send such an object across the network, the 'members' field is 
only marshalled once, leading to smaller messages


Next up, I'm going to tackle [2] which will reduce the size of view 
messages even further: instead of sending the *full view* every time, we 
only send delta views. I believe JGRP-1317 and JGRP-1354 will have a 
huge impact on systems with a large number of nodes.


[1] https://issues.jboss.org/browse/JGRP-1317
[2] https://issues.jboss.org/browse/JGRP-1354


-- 
Bela Ban, JGroups lead (http://www.jgroups.org)