hadoop FSCachingGetSpaceUsed 源码
haddop FSCachingGetSpaceUsed 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/FSCachingGetSpaceUsed.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.datanode;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.CachingGetSpaceUsed;
import org.apache.hadoop.fs.GetSpaceUsed;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Fast and accurate class to tell how much space HDFS is using.
*/
@InterfaceAudience.Private
@InterfaceStability.Evolving
public abstract class FSCachingGetSpaceUsed extends CachingGetSpaceUsed {
static final Logger LOG =
LoggerFactory.getLogger(FSCachingGetSpaceUsed.class);
public FSCachingGetSpaceUsed(Builder builder) throws IOException {
super(builder);
}
/**
* The builder class.
*/
public static class Builder extends GetSpaceUsed.Builder {
private FsVolumeImpl volume;
private String bpid;
public FsVolumeImpl getVolume() {
return volume;
}
public Builder setVolume(FsVolumeImpl fsVolume) {
this.volume = fsVolume;
return this;
}
public String getBpid() {
return bpid;
}
public Builder setBpid(String bpid) {
this.bpid = bpid;
return this;
}
@Override
public GetSpaceUsed build() throws IOException {
Class clazz = getKlass();
if (FSCachingGetSpaceUsed.class.isAssignableFrom(clazz)) {
try {
setCons(clazz.getConstructor(Builder.class));
} catch (NoSuchMethodException e) {
throw new RuntimeException(e);
}
}
return super.build();
}
}
}
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