[jira] [Created] (FLINK-3756) Introduce state hierarchy in CheckpointCoordinator

[Shang Yuanchun (Jira)]

Till Rohrmann created FLINK-3756:
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             Summary: Introduce state hierarchy in CheckpointCoordinator
                 Key: FLINK-3756
                 URL: https://issues.apache.org/jira/browse/FLINK-3756
             Project: Flink
          Issue Type: Sub-task
          Components: JobManager
    Affects Versions: 1.1.0
            Reporter: Till Rohrmann
            Assignee: Till Rohrmann
             Fix For: 1.1.0


Currently, the {{CheckpointCoordinator}} stores the state handles for all tasks in a list. This lack of structure does not allow to easily group all tasks belonging to the same {{ExecutionJobVertex}} together. With the introduction of key groups, it will be necessary to store the key-group state handles of the different tasks grouped together to make them easily accessible for redistribution.

Therefore, I propose to introduce the notion of a state for task groups which groups the state for all tasks belonging to the same {{ExecutionJobVertex}} together. This task group can then also be used to accumulate the key-group states from the different tasks.



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