[FLINK-3255] Chaining behavior should not depend on parallelism

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.10.1
• Fix Version/s: 1.0.0
• Assignee: Stephan Ewen
• Reporter: Stephan Ewen
• Created: 18/Jan/16 17:37
• Updated: 28/Feb/19 11:14
• Resolved: 25/Jan/16 14:23

Description

Currently, operators are chained more aggressively when the parallelism is one. That makes debugging tougher as it changes threading behavior.

The benefits are also limited: Real installations where that type of efficiency would be needed would not run in parallelism 1, or would not use a partitioning/broadcast step there (if explicitly required to run parallelism 1).

In the future, when we want to allow parallelism to be adjusted dynamically, this will be even more tricky.