org.apache.flink.runtime.jobgraph.ScheduleMode Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* 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
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.flink.runtime.jobgraph;
/**
* The ScheduleMode decides how tasks of an execution graph are started.
*/
public enum ScheduleMode {
/** Schedule tasks lazily from the sources. Downstream tasks are started once their input data are ready */
LAZY_FROM_SOURCES(true),
/**
* Same as LAZY_FROM_SOURCES just with the difference that it uses batch slot requests which support the
* execution of jobs with fewer slots than requested. However, the user needs to make sure that the job
* does not contain any pipelined shuffles (every pipelined region can be executed with a single slot).
*/
LAZY_FROM_SOURCES_WITH_BATCH_SLOT_REQUEST(true),
/** Schedules all tasks immediately. */
EAGER(false);
private final boolean allowLazyDeployment;
ScheduleMode(boolean allowLazyDeployment) {
this.allowLazyDeployment = allowLazyDeployment;
}
/**
* Returns whether we are allowed to deploy consumers lazily.
*/
public boolean allowLazyDeployment() {
return allowLazyDeployment;
}
}