org.apache.flink.runtime.execution.ExecutionState Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* 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.execution;
/**
* An enumeration of all states that a task can be in during its execution. Tasks usually start in
* the state {@code CREATED} and switch states according to this diagram:
*
* {@code
* CREATED -> SCHEDULED -> DEPLOYING -> INITIALIZING -> RUNNING -> FINISHED
* | | | | |
* | | | +-----+--------------+
* | | V V
* | | CANCELLING -----+----> CANCELED
* | | |
* | +-------------------------+
* |
* | ... -> FAILED
* V
* RECONCILING -> INITIALIZING | RUNNING | FINISHED | CANCELED | FAILED
*
* }
*
* It is possible to enter the {@code RECONCILING} state from {@code CREATED} state if job
* manager fail over, and the {@code RECONCILING} state can switch into any existing task state.
*
*
It is possible to enter the {@code FAILED} state from any other state.
*
*
The states {@code FINISHED}, {@code CANCELED}, and {@code FAILED} are considered terminal
* states.
*/
public enum ExecutionState {
CREATED,
SCHEDULED,
DEPLOYING,
RUNNING,
/**
* This state marks "successfully completed". It can only be reached when a program reaches the
* "end of its input". The "end of input" can be reached when consuming a bounded input (fix set
* of files, bounded query, etc) or when stopping a program (not cancelling!) which make the
* input look like it reached its end at a specific point.
*/
FINISHED,
CANCELING,
CANCELED,
FAILED,
RECONCILING,
/** Restoring last possible valid state of the task if it has it. */
INITIALIZING;
public boolean isTerminal() {
return this == FINISHED || this == CANCELED || this == FAILED;
}
}