[jira] [Created] (FLINK-7866) Weigh list of preferred locations for scheduling

["Till Rohrmann (JIRA)" <ji...@apache.org>]

Till Rohrmann created FLINK-7866:
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             Summary: Weigh list of preferred locations for scheduling
                 Key: FLINK-7866
                 URL: https://issues.apache.org/jira/browse/FLINK-7866
             Project: Flink
          Issue Type: Improvement
          Components: Scheduler
    Affects Versions: 1.3.2, 1.4.0
            Reporter: Till Rohrmann
             Fix For: 1.5.0


[~sihuazhou] proposed to not only use the list of preferred locations to decide where to schedule a task, but to also weigh the list according to how often a location appeared and then select the location based on the weight. That way, we would obtain better locality in some cases.

Example:

Preferred locations list: {{{location1, location2, location2}}}
Weighted preferred locations list {{{ (location2 , 2), (location1, 1)}}}



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