hadoop DFCachingGetSpaceUsed 源码
haddop DFCachingGetSpaceUsed 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/DFCachingGetSpaceUsed.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.fs;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import java.io.IOException;
/**
* Fast but inaccurate class to tell how much space HDFS is using.
* This class makes the assumption that the entire mount is used for
* HDFS and that no two hdfs data dirs are on the same disk.
*
* To use set fs.getspaceused.classname
* to org.apache.hadoop.fs.DFCachingGetSpaceUsed in your core-site.xml
*
*/
@InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"})
@InterfaceStability.Evolving
public class DFCachingGetSpaceUsed extends CachingGetSpaceUsed {
private final DF df;
public DFCachingGetSpaceUsed(Builder builder) throws IOException {
super(builder);
this.df = new DF(builder.getPath(), builder.getInterval());
}
@Override
protected void refresh() {
this.used.set(df.getUsed());
}
}
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