Re: [infinispan-dev] Partial state transfer in Infinispan

>>> Why are we actually using JGroups' state transfer with replication, but >>> use our own state transfer with distribution ? >> >> I don't know, but guess it's because each node has a different set of >> keys so no node has the same state as another ? > > You could still use JGroups state transfer; getState() would list the > state provider as target node. > > In general, partial state transfer involves transferring (1) the partial > state and (2) the digest, which is a vector of highest seqnos seen for > every member. When we get a partial state, we always overwrite our own > digest with the one received, and update our state accordingly. However, > when this is done a couple of times, for different partial states, I'm > not sure that we won't receive a few messages multiple times, due to the > digest overwriting... > > I think the cleanest solution would be for you guys to reuse the state > transfer you already use for state transfer in distribution mode. +1. There's also transaction logic* related to state transfer, which would need to be maintained in two implementations - not good! * actually the transaction-failover logic needs to be revisited especially after the new rebalancing code. Dan and I will go over it next week - we working at his place and this will make things easier.