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Posted to issues@flink.apache.org by "Till Rohrmann (JIRA)" <ji...@apache.org> on 2016/04/14 11:05:25 UTC

[jira] [Created] (FLINK-3755) Introduce key groups for key-value state to support dynamic scaling

Till Rohrmann created FLINK-3755:
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             Summary: Introduce key groups for key-value state to support dynamic scaling
                 Key: FLINK-3755
                 URL: https://issues.apache.org/jira/browse/FLINK-3755
             Project: Flink
          Issue Type: New Feature
    Affects Versions: 1.1.0
            Reporter: Till Rohrmann
            Assignee: Till Rohrmann


In order to support dynamic scaling, it is necessary to sub-partition the key-value states of each operator. This sub-partitioning, which produces a set of key groups, allows to easily scale in and out Flink jobs by simply reassigning the different key groups to the new set of sub tasks. The idea of key groups is described in this design document [1]. 

[1] https://docs.google.com/document/d/1G1OS1z3xEBOrYD4wSu-LuBCyPUWyFd9l3T9WyssQ63w/edit?usp=sharing



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