Kostas Kloudas created FLINK-5056:
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Summary: BucketingSink deletes valid data when checkpoint
notification is slow.
Key: FLINK-5056
URL: https://issues.apache.org/jira/browse/FLINK-5056
Project: Flink
Issue Type: Bug
Components: filesystem-connector
Affects Versions: 1.1.3
Reporter: Kostas Kloudas
Assignee: Kostas Kloudas
Fix For: 1.2.0
Currently if BucketingSink receives no data after a checkpoint and then a
notification about a previous checkpoint arrives, it clears its state. This can
lead to not committing valid data about intermediate checkpoints for whom
a notification has not arrived yet. As a simple sequence that illustrates the
problem:
-> input data
-> snapshot(0)
-> input data
-> snapshot(1)
-> no data
-> notifyCheckpointComplete(0)
the last will clear the state of the Sink without committing as final the data
that arrived for checkpoint 1.
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