/**
* 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.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 xceiver count */
public int getXceiverCount();
/**
* @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();
}