[CANCEL][VOTE] Apache Samza 0.13.0 release

[Bharath Kumara Subramanian <co...@gmail.com>]

<resending on Prateek's behalf>

Hi all,

This is an official CANCEL for the RC0 vote, and a status update for the
new RC. Resending this since previous emails did not get delivered to the
list.

We found a few issues in RC0 during further testing.
The following issues are already fixed and will be available in new RC:
SAMZA-1286: Close zk connection in ZkController.stop()
SAMZA-1288: Add null check for sink OutputStream
SAMZA-1289: Default id generator if not configured

We're waiting for the following additional items, after which we'll create
the new RC.
SAMZA-1064: Remove dependency of debounce timer from the CoordinationUtils
SAMZA-1298: if ZkConnect string contains extra path, it needs to be created
on the ZK.

We're downgrading the priority for the following from blocker to major. It
might not be part of 0.13.0: SAMZA-1153: Metrics should be added for ZK
based JobCoordinator

We're also updating the documentation and hello-samza tutorials for the new
features. New documentation will be available as part of the final 0.13.0
release.

Thanks,
Prateek