/**
* 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.blur.kvs;
import java.io.FilterInputStream;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
public class HdfsUtils {
private static final String IN = "in";
private static final String GET_FILE_LENGTH = "getFileLength";
public static long getFileLength(FileSystem fileSystem, Path path, FSDataInputStream inputStream) throws IOException {
FileStatus fileStatus = fileSystem.getFileStatus(path);
long dfsLength = getDFSLength(inputStream);
return Math.max(dfsLength, fileStatus.getLen());
}
public static long getDFSLength(FSDataInputStream inputStream) throws IOException {
try {
Field field = FilterInputStream.class.getDeclaredField(IN);
field.setAccessible(true);
Object dfs = field.get(inputStream);
Method method = dfs.getClass().getMethod(GET_FILE_LENGTH, new Class[] {});
Object length = method.invoke(dfs, new Object[] {});
return (Long) length;
} catch (Exception e) {
throw new IOException(e);
}
}
}