Till Rohrmann created FLINK-20846:
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Summary: Decouple checkpoint services from CheckpointCoordinator
Key: FLINK-20846
URL: https://issues.apache.org/jira/browse/FLINK-20846
Project: Flink
Issue Type: Improvement
Components: Runtime / Coordination
Affects Versions: 1.13.0
Reporter: Till Rohrmann
Assignee: Till Rohrmann
Fix For: 1.13.0
In order to reuse checkpoints across different {{ExecutionGraph}} instances
(w/o HA), we need to decouple the checkpoint services
{{CompletedCheckpointStore}} and {{CheckpointIDCounter}} from the
{{CheckpointCoordinator}}. The reason is that the {{CheckpointCoordinator}} is
bound to the lifetime of an {{ExecutionGraph}} and shuts the services down once
the {{ExecutionGraph}} reaches a terminal state. Once this is no longer the
case, it would be possible to create a new {{ExecutionGraph}} which can resume
from a previous checkpoint if the appropriate {{CompletedCheckpointStore}} is
provided.
For future scheduler implementations which want to reuse the {{ExecutionGraph}}
but need to create different instances this is a requirement to support state
recovery.
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