[infinispan-dev] An observation about total order and consistency

[Mircea Markus]

With total order and sync replication it is possible for the following:

tm.begin()
cache(0).put(k,v);
tm.commit();

assert cache(0).get(k).equals(v); //always passes
assert cache(1).get(k).equals(v); //might fail!
//..but
eventually(cache(1).get(k).equals(v)) //this will always pass

In other words, after a transaction is completed, you are only guaranteed to see its results on the originator node. On replicas the value is only eventually made available.  
Whilst this is fine for embedded caches, as in practice the replication would happen between different JVMs, this is still relevant for:
- hotrod: a client might tx-write on a node and read from the other
- tests

Cheers
Mircea
--
Mircea Markus
twitter.com/mirceamarkus

Sr. Software Engineer, Infinispan
http://www.infinispan.org