Validate X-Druid-Task-Id header in request/response and support retrying on outdated TaskLocation information, add KafkaIndexTaskClient unit tests#3006

Merged

fjy merged 2 commits intoapache:masterfrom dclim:task-id-header

May 26, 2016

+1,133-229

Commits on May 20, 2016

validate X-Druid-Task-Id header in request and add header to response
dclim
committed

Commits on May 26, 2016

modify KafkaIndexTaskClient to take a TaskLocationProvider as the TaskLocation may not remain constant
dclim
committed