akka/akka — pull request #15471 by patriknw (2014-06-30 07:09:33+00:00)
Title: =con #15440 Add invariant checks to ClusterSharding state

* I suspect that the issue #15440 happens because of replay of events
in wrong order (ShardHomeAllocated received before ShardRegionRegistered)
by the hbase journal
* This does not fix that issue, but the additional invariant checks and
debug statements would perhaps make it easier for us to diagnose such
issues
* These changes also ensures that the allocation strategy does not return
the wrong thing.
* It also tightens a possible error if a region is terminated while a
rebalance is in progress