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Aljoscha Krettek updated FLINK-3761: ------------------------------------ Summary: Refactor State Backends/Make Keyed State Key-Group Aware (was: Introduce key group state backend) > Refactor State Backends/Make Keyed State Key-Group Aware > -------------------------------------------------------- > > Key: FLINK-3761 > URL: https://issues.apache.org/jira/browse/FLINK-3761 > Project: Flink > Issue Type: Sub-task > Components: State Backends, Checkpointing > Reporter: Till Rohrmann > Assignee: Aljoscha Krettek > > 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). -- This message was sent by Atlassian JIRA (v6.3.4#6332)