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Posted to issues@flink.apache.org by "Stefan Richter (JIRA)" <ji...@apache.org> on 2017/03/30 13:01:41 UTC

[jira] [Created] (FLINK-6220) Fine-grained copy-on-write for Heap(Map/List)States in CopyOnWriteStateTable

Stefan Richter created FLINK-6220:
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             Summary: Fine-grained copy-on-write for Heap(Map/List)States in CopyOnWriteStateTable
                 Key: FLINK-6220
                 URL: https://issues.apache.org/jira/browse/FLINK-6220
             Project: Flink
          Issue Type: Improvement
    Affects Versions: 1.3.0
            Reporter: Stefan Richter
            Priority: Minor


Currently, the copy-on-write mechanism in {{CopyOnWriteStateTable}} uses serializers to create copies of state objects. In case of {{Heap(Map/List)State}}, those state objects are collections, and a deep copy-on-write is performed on those collections as a whole. We can investigate ways to track changes on a more fine grained level, for example deep copy only individual entries in the lists or maps.



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