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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