hadoop RejectionReason 源码
haddop RejectionReason 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/RejectionReason.java
/**
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.hadoop.yarn.api.records;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* Reason for rejecting a Scheduling Request.
*/
@InterfaceAudience.Public
@InterfaceStability.Unstable
public enum RejectionReason {
/**
* This is used to indicate a possible constraint violation. For eg. If the
* App requested anti-affinity across 5 container requests, but only 4 nodes
* exist. Another eg. could be if tag A has affinity with tag B and tag B has
* affinity with tag C, but tag A has anti-affinity with tag C, all at a rack
* scope - and only 1 rack exists. Essentially all situations where the
* Algorithm cannot assign a Node to SchedulingRequest.
*/
COULD_NOT_PLACE_ON_NODE,
/**
* This is used to indicate when after the Algorithm has placed a Scheduling
* Request at a node, but the commit failed because the Queue has no
* capacity etc. This can be a transient situation.
*/
COULD_NOT_SCHEDULE_ON_NODE
}
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