org.apache.flink.runtime.jobmaster.RescalingBehaviour Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
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*/
package org.apache.flink.runtime.jobmaster;
import org.apache.flink.runtime.jobgraph.JobVertex;
import org.apache.flink.util.FlinkException;
import org.apache.flink.util.function.BiConsumerWithException;
/**
* Definition of the rescaling behaviour.
*/
public enum RescalingBehaviour implements BiConsumerWithException {
// rescaling is only executed if the operator can be set to the given parallelism
STRICT {
@Override
public void acceptWithException(JobVertex jobVertex, Integer newParallelism) throws FlinkException {
if (jobVertex.getMaxParallelism() < newParallelism) {
throw new FlinkException("Cannot rescale vertex " + jobVertex.getName() +
" because its maximum parallelism " + jobVertex.getMaxParallelism() +
" is smaller than the new parallelism " + newParallelism + '.');
} else {
jobVertex.setParallelism(newParallelism);
}
}
},
// the new parallelism will be the minimum of the given parallelism and the maximum parallelism
RELAXED {
@Override
public void acceptWithException(JobVertex jobVertex, Integer newParallelism) {
jobVertex.setParallelism(Math.min(jobVertex.getMaxParallelism(), newParallelism));
}
}
}