[jira] [Created] (SLIDER-799) AM to decide when to relax placement policy from specific host to rack/cluster

["Steve Loughran (JIRA)" <ji...@apache.org>]

Steve Loughran created SLIDER-799:
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             Summary: AM to decide when to relax placement policy from specific host to rack/cluster
                 Key: SLIDER-799
                 URL: https://issues.apache.org/jira/browse/SLIDER-799
             Project: Slider
          Issue Type: Sub-task
          Components: appmaster
    Affects Versions: Slider 0.70
            Reporter: Steve Loughran
             Fix For: Slider 0.80


If Slider asks for relaxed affinity, YARN only gives it ~1 second for free capacity to appear on a node before it falls back to non-local assignment. While this is OK for analytics throughput, it's suboptimal for placement of code such as HBase region servers.

AM needs to take charge of the placement and decide for itself when to convert from placed to relaxed.



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