CombineTextInputFormat instead of TextInputFormat combines multiple splits for a single mapper and reduces the strain on hadoop platform. It greatly improves job completion time as there are fewer number of mappers to bookkeep.

CombineTextInputFormat instead of TextInputFormat combines multiple splits for a single mapper and reduces the strain on hadoop platform. It greatly improves job completion time as there are fewer number of mappers to bookkeep.

Add a context to force 2 pass algorithm for topNs

make timeline findOvershadowed a set

Snapshot coordinator state before running anything

fix BatchServerInventoryViewTest waitForSync() logic

Make tests pass with Java 8

changed the url for kafka wget (old one was 404)

make prioritized executor service listenable

fix race condition with merge and persist and sink adding

Conflicts:
	indexing-service/src/main/java/io/druid/indexing/common/task/IndexTask.java
	server/src/main/java/io/druid/segment/realtime/RealtimeManager.java
	server/src/main/java/io/druid/segment/realtime/plumber/RealtimePlumber.java

Replace Iterable with Sequence in CursorFactory