logstash/logstash — pull request #732 by jordansissel (2013-10-18 20:20:39+00:00)
Title: Allow output plugins to declare that, for a given configuration, workers...

... are

not supported. Such reasons could include inability to share a resource
(like a listening socket, etc). This declaration will force a
single-worker setting and allow logstash to warn the user instead of
aborting.