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From "Julia (JIRA)" <>
Subject [jira] [Comment Edited] (REEF-1251) IMRU Driver handlers for Fault Tolerant
Date Wed, 31 Aug 2016 22:03:20 GMT


Julia edited comment on REEF-1251 at 8/31/16 10:03 PM:

REEF-1550 and REEF-1549 have been created fort he follow up. 

was (Author: juliaw):
REEF-1550 and REEF-1551 has been created fort he follow up. 

> IMRU Driver handlers for Fault Tolerant
> ---------------------------------------
>                 Key: REEF-1251
>                 URL:
>             Project: REEF
>          Issue Type: Task
>          Components: REEF.NET, REEF.NET Evaluator
>            Reporter: Julia
>            Assignee: Julia
>              Labels: FT
> Handles communications between driver and evaluators for evaluator and task recovery
when some evaluators fail. The following describe a flow for an example:
> Here is the control flow in normal scenario:
> a.	All the task, context and task status information is maintained in Task Manager when
tasks are created at the first time
> b.	Task1, task2, Task3 s are queued in Task Starter 
> c.	When all tasks in a group is ready, tasks are submitted
> d.	When tasks start running, task status is updated in Task Manager
> e.	Evaluator 3 failed 
> f.	Driver received failed evaluator event and report it to Evaluator Manager
> g.	Task Manager update task status to set task3 as failed
> h.	Driver send message to task1 and task2 to stop them and update task status in Task
> i.	Driver request a new evaluator3’ for failed evaluator and submit a new context3’
for it and add a new task3’ to the queue
> j.	Driver recreate task1’ and task2’ with existing context1 and context2 add them
to the queue
> k.	When all the new tasks in the communication group are ready, start tasks as in step

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