[IGNITE-4461] Hadoop: automatically define best "partially raw" comparator based on key type

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.8
• Fix Version/s: 2.0
• Component/s: hadoop
• Assignee: Vladimir Ozerov
• Reporter: Vladimir Ozerov
• Created: 19/Dec/16 14:59
• Updated: 05/Jan/17 11:47
• Resolved: 05/Jan/17 11:47

Description

We have special PartiallyRawComparator interface which provides nice speedup by removing unnecessary objects deserializations during insert into result multi-map. And we have a one implementation for now for Text class: TextPartiallyRawComparator.

We should do the following:
1) Try guessing proper comparator in runtime using JobConf.getOutputKeyClass() property.
2) Add ability to disable this automatic resolution.