elasticsearch/elasticsearch — pull request #7493 by bleskes (2014-08-28 07:06:53+00:00)
Title: [Discovery] accumulated improvements to ZenDiscovery

This PR contains the accumulated work from the feautre/improve_zen branch. Here are the highlights of the changes:

__Testing infra__
- Networking:
- all symmetric partitioning
- dropping packets
- hard disconnects
- Jepsen Tests
- Single node service disruptions:
- Long GC / Halt
- Slow cluster state updates
- Discovery settings
- Easy to setup unicast with partial host list

__Zen Discovery__
- Pinging after master loss (no local elects)
- Fixes the split brain issue: #2488
- Batching join requests
- More resilient joining process (wait on a publish from master)