[TAJO-1049] Remove the parallel degree limit up to the maximum cluster capacity

• Type: Improvement
• Status: Resolved
• Priority: Trivial
• Resolution: Fixed
• Fix Version/s: 0.9.0
• Component/s: Data Shuffle, distributed query plan
• Assignee: Hyunsik Choi
• Reporter: Hyunsik Choi
• Created: 17/Sep/14 15:34
• Updated: 21/Sep/14 18:37
• Resolved: 21/Sep/14 18:17

Description

The maximum parallel degree had been limited by the number of cluster node capacity. This was because the old hash shuffle approach created too many small files depending on the number of parallel degree of a stage.

But, TAJO-992 solved this problem. We don't need to use this limit anymore. This patch removes the limit.

I think that this patch requires cluster test and it is hard to verify this patch in unit tests.