[FLINK-8629] Allow JobMaster to rescale jobs

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.5.0
• Fix Version/s: 1.5.0
• Component/s: Runtime / Coordination
• Labels: flip-6
• Assignee: Till Rohrmann
• Reporter: Till Rohrmann
• Created: 09/Feb/18 20:10
• Updated: 23/Feb/18 09:26
• Resolved: 23/Feb/18 09:26

Description

The JobMaster should be able to rescale a job or a subset of its operators. In order to do that we have to expose RPC calls to trigger this action.

The rescaling works by first taking a savepoint, then suspending the old job, rescale it and then restart it from the taken savepoint.

Issue Links

• links to: GitHub Pull Request #5446