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From "Ilya Lantukh (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-5068) Redesign usage of GridDhtPartitionTopologyImpl.part2node map to store only diff from affinity assignment
Date Mon, 24 Apr 2017 14:02:04 GMT
Ilya Lantukh created IGNITE-5068:
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             Summary: Redesign usage of GridDhtPartitionTopologyImpl.part2node map to store
only diff from affinity assignment
                 Key: IGNITE-5068
                 URL: https://issues.apache.org/jira/browse/IGNITE-5068
             Project: Ignite
          Issue Type: Improvement
    Affects Versions: 2.0
            Reporter: Ilya Lantukh
            Assignee: Ilya Lantukh


This map can become very huge on large topologies, and rebuilding it on each update is also
costly. Some beneficial changes were made in the scope of IGNITE-4626, but further improvement
requires complete redesign.
This map always stores affinity nodes + some additional "temporary owners". Those owners are
only needed to complete rebalancing and they will evict partition when rebalancing is finished.
It seems that storing only those non-affinity owners can greatly reduce memory required by
this map (it will be empty on stable topology) and effort needed to keep it consistent with
node2part.



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