I'm pretty excited about this one so I want to pre-annouce it. I'm currently
working on rolling release/upgrade support in Exhibitor and Curator.
For Exhibitor:
* Ensemble list, config values, etc. are centralized (via Amazon S3, a
shared file, etc.)
* If the ensemble list changes, Exhibitor will stage the change so that
each instance in the ensemble
applies the change one at a time, thus accomplishing a rolling release
* New servers can be added to the ensemble this way without taking down the
cluster
For Curator:
* Curator can now be configured to poll the Exhibitor instances to get the
list of ZK servers in the ensemble
* Curator will use the updated ensemble list when creating connections.
* If a Sys-Disconnected is received and there is a new ensemble list,
Curator will close the current ZK
handle and create a new one using the updated list.
Coming soon!
-Jordan
