hadoop DatanodeStatistics 源码
haddop DatanodeStatistics 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeStatistics.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 java.util.Map;
import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.hdfs.protocol.ClientProtocol;
/** Datanode statistics */
public interface DatanodeStatistics {
/** @return the total capacity */
public long getCapacityTotal();
/** @return the used capacity */
public long getCapacityUsed();
/** @return the percentage of the used capacity over the total capacity. */
public float getCapacityUsedPercent();
/** @return the remaining capacity */
public long getCapacityRemaining();
/** @return the percentage of the remaining capacity over the total capacity. */
public float getCapacityRemainingPercent();
/** @return the block pool used. */
public long getBlockPoolUsed();
/** @return the percentage of the block pool used space over the total capacity. */
public float getPercentBlockPoolUsed();
/** @return the total cache capacity of all DataNodes */
public long getCacheCapacity();
/** @return the total cache used by all DataNodes */
public long getCacheUsed();
/** @return the xceiver count */
public int getXceiverCount();
/** @return average xceiver count for non-decommission(ing|ed) nodes */
public int getInServiceXceiverCount();
/** @return number of non-decommission(ing|ed) nodes */
public int getNumDatanodesInService();
/**
* @return the total used space by data nodes for non-DFS purposes
* such as storing temporary files on the local file system
*/
public long getCapacityUsedNonDFS();
/** The same as {@link ClientProtocol#getStats()}.
* The block related entries are set to -1.
*/
public long[] getStats();
/** @return the expired heartbeats */
public int getExpiredHeartbeats();
/** @return Storage Tier statistics*/
Map<StorageType, StorageTypeStats> getStorageTypeStats();
/** @return the provided capacity */
public long getProvidedCapacity();
}
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