hadoop BlockPlacementStatus 源码
haddop BlockPlacementStatus 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementStatus.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
*
* 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.hadoop.hdfs.server.blockmanagement;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
@InterfaceAudience.Private
@InterfaceStability.Evolving
public interface BlockPlacementStatus {
/**
* Boolean value to identify if replicas of this block satisfy requirement of
* placement policy
* @return if replicas satisfy placement policy's requirement
*/
public boolean isPlacementPolicySatisfied();
/**
* Get description info for log or printed in case replicas are failed to meet
* requirement of placement policy
* @return description in case replicas are failed to meet requirement of
* placement policy
*/
public String getErrorDescription();
/**
* Return the number of additional replicas needed to ensure the block
* placement policy is satisfied.
* @return The number of new replicas needed to satisify the placement policy
* or zero if no extra are needed
*/
int getAdditionalReplicasRequired();
}
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