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From "Stephan Ewen (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (FLINK-4459) Introduce SlotProvider for Scheduler
Date Sun, 04 Sep 2016 21:13:20 GMT

     [ https://issues.apache.org/jira/browse/FLINK-4459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Stephan Ewen closed FLINK-4459.
-------------------------------

> Introduce SlotProvider for Scheduler
> ------------------------------------
>
>                 Key: FLINK-4459
>                 URL: https://issues.apache.org/jira/browse/FLINK-4459
>             Project: Flink
>          Issue Type: Improvement
>          Components: Scheduler
>            Reporter: Till Rohrmann
>            Assignee: Kurt Young
>             Fix For: 1.2.0
>
>
> Currently the {{Scheduler}} maintains a queue of available instances which it scans if
it needs a new slot. If it finds a suitable instance (having free slots available) it will
allocate a slot from it. 
> This slot allocation logic can be factored out and be made available via a {{SlotProvider}}
interface. The {{SlotProvider}} has methods to allocate a slot given a set of location preferences.
Slots should be returned as {{Futures}}, because in the future the slot allocation might happen
asynchronously (Flip-6). 
> In the first version, the {{SlotProvider}} implementation will simply encapsulate the
existing slot allocation logic extracted from the {{Scheduler}}. When a slot is requested
it will return a completed or failed future since the allocation happens synchronously.
> The refactoring will have the advantage to simplify the {{Scheduler}} class and to pave
the way for upcoming refactorings (Flip-6).



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