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https://issues.apache.org/jira/browse/FLINK-3756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15257819#comment-15257819
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ASF GitHub Bot commented on FLINK-3756:
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Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/1883#issuecomment-214683701
I agree. Our terminology is a mess an should be cleaned up. Will do this as
part of my other refactorings.
> 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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