[REEF-1011] Use Optional in favor of null check in VortexFuture

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.14
• Component/s: Vortex
• Assignee: Andrew Chung
• Reporter: Andrew Chung
• Created: 23/Nov/15 06:09
• Updated: 23/Nov/15 08:00
• Resolved: 23/Nov/15 08:00

Description

To allow null values in user result, we should use Optional to indicate whether or not getting a result from a Tasklet has failed instead.

Issue Links

• links to: Link to PR