elasticsearch/elasticsearch — pull request #7889 by bleskes (2014-09-26 08:22:20+00:00)
Title: NodesFD: simplify concurrency control to fully rely on a single map

The node fault detection class is used by the master node to ping the nodes in the cluster and verify they are alive. This PR simplifies the concurrency controls in the class + adds a test for a scenario that surfaced the problem.