This morning I reviewed a change to the cassandra charm which takes advantage of the leadership features of juju, and bumps the default cassandra version to 2.1.7. [0]
The changes look great in general, although there are some test failures to address before merging. On a related note, a new `coordinator` module, used in cassandra, has been merged into charmhelpers. This module provides a nice abstraction over unit coordination using juju leadership. Description from the commit log: "Coordinate operations in hooks using leadership. Common uses will be rolling restarts and rolling upgrades. App specific applications will be things like 'don't reboot while another node is streaming data from you' or 'don't bootstrap until the seed nodes are ready' or 'only allow (num_nodes/2-1) units to bootstrap at a time." Thanks to stub for this fine work! [0] https://code.launchpad.net/~stub/charms/trusty/cassandra/spike/+merge/262608
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