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Date: Tue, 7 Jun 2016 03:17:20 +0000 (UTC)
From: "Julia (JIRA)" <jira@apache.org>
To: dev@reef.apache.org
Message-ID: <JIRA.12949314.1457731216000.9313.1465269440944@Atlassian.JIRA>
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Subject: [jira] [Updated] (REEF-1251) IMRU Driver handlers for Fault
 Tolerant
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archived-at: Tue, 07 Jun 2016 03:17:22 -0000


     [ https://issues.apache.org/jira/browse/REEF-1251?page=3Dcom.atlassian=
.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julia updated REEF-1251:
------------------------
    Summary: IMRU Driver handlers for Fault Tolerant  (was: Driver handlers=
 in Evaluator recovery )

> IMRU Driver handlers for Fault Tolerant
> ---------------------------------------
>
>                 Key: REEF-1251
>                 URL: https://issues.apache.org/jira/browse/REEF-1251
>             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 ta=
sk recovery when some evaluators fail. The following describe a flow for an=
 example:
> Here is the control flow in normal scenario:
> a.=09All the task, context and task status information is maintained in T=
ask Manager when tasks are created at the first time
> b.=09Task1, task2, Task3 s are queued in Task Starter=20
> c.=09When all tasks in a group is ready, tasks are submitted
> d.=09When tasks start running, task status is updated in Task Manager
> e.=09Evaluator 3 failed=20
> f.=09Driver received failed evaluator event and report it to Evaluator Ma=
nager
> g.=09Task Manager update task status to set task3 as failed
> h.=09Driver send message to task1 and task2 to stop them and update task =
status in Task Manager
> i.=09Driver request a new evaluator3=E2=80=99 for failed evaluator and su=
bmit a new context3=E2=80=99 for it and add a new task3=E2=80=99 to the que=
ue
> j.=09Driver recreate task1=E2=80=99 and task2=E2=80=99 with existing cont=
ext1 and context2 add them to the queue
> k.=09When all the new tasks in the communication group are ready, start t=
asks as in step c.


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