[REEF-1051] Add an interface to query a Tasklet's status in VortexMaster

• Type: New Feature
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Vortex
• Assignee: Unassigned
• Reporter: Yunseong Lee
• Created: 08/Dec/15 08:49
• Updated: 08/Dec/15 08:49

Description

Currently, we don't have any interface for checking the status of Tasklets. Having one would be useful for users, especially for testing.

I think a Tasklet can be in

• SUBMITTED: When the Tasklet is submitted, and waiting in the pending queue(VortexThreadPool.submit())
• RUNNING: When the Tasklet is sent to scheduled worker, and executed (RunningWorkers.launchTasklet())
• FINISHED, FAILED, CANCELLED: as the result of Tasklets.

Questions I have in mind:

• Would it be useful to store the history, so we can query the Tasklets launched before?
• Do we need to breakdown RUNNING state? For example, the Tasklet can be 1) sent to the worker, 2) pending in the worker's local queue, 3) running. IMHO, considering all above as a RUNNING state would be enough for now. Any thought?