Joshua Schneider created FLINK-12126:
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Summary: Make relaxed rescaling behaviour accessible in REST
interface
Key: FLINK-12126
URL: https://issues.apache.org/jira/browse/FLINK-12126
Project: Flink
Issue Type: Improvement
Components: Runtime / REST
Affects Versions: 1.7.2
Reporter: Joshua Schneider
The REST handler for rescaling uses RescalingBehaviour.STRICT as a hard-coded
parameter. This has the following consequences when a job is rescaled:
* All operators are set to the new parallelism. If at least one operator's max
parallelism is less than the new parallelism, the rescale operation is aborted.
* Therefore, it is impossible to restrict the parallelism of a subset of
operators (say, to one) in combination with rescaling.
A different behaviour which fixes these issues, RescalingBehaviour.RELAXED, is
already provided by the internal API. However, it appears to be unused.
The REST interface should provide a parameter that selects the strategy.
Alternatively, it could be a setting of the job.
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