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Combine batches of successive roles for same nodes, #1345

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Combine batches of successive roles for same nodes, #1345

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Commits on Oct 19, 2017

  1. Combine batches of successive roles for same nodes, 

    We can speed-up the application of (n+1)th role if both(n,n+1)
roles are being applied on the same node. This speedup of deployment of
ceilometer by atleast 1m20s (measured: 90sec) and swift by ~20s.

eg. In our 2node deployment ceilometer{server,central} are always
applied on the same node, given that they have different priorities, they are
to be applied, one after the other.

This does not violate any order constraints as the application procedure
of (n+1)th role is transparent to the nth role
    Sumit Jamgade committed Oct 19, 2017
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