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From "Till Rohrmann (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-3761) Introduce key group state backend
Date Thu, 14 Apr 2016 16:59:25 GMT
Till Rohrmann created FLINK-3761:
------------------------------------

             Summary: Introduce key group state backend
                 Key: FLINK-3761
                 URL: https://issues.apache.org/jira/browse/FLINK-3761
             Project: Flink
          Issue Type: Sub-task
          Components: state backends
            Reporter: Till Rohrmann
            Assignee: Till Rohrmann


After an off-line discussion with [~aljoscha], we came to the conclusion that it would be
beneficial to reflect the differences between a keyed and a non-keyed stream also in the state
backends. A state backend which is used for a keyed stream offers a value, list, folding and
value state and has to group its keys into key groups. 

A state backend for non-keyed streams can only offer a union state to make it work with dynamic
scaling. A union state is a state which is broadcasted to all tasks in case of a recovery.
The state backends can then select what information they need to recover from the whole state
(formerly distributed).



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