org.apache.hadoop.hive.shims.HiveHarFileSystem Maven / Gradle / Ivy
/**
* 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.hive.shims;
import java.io.IOException;
import org.apache.hadoop.fs.BlockLocation;
import org.apache.hadoop.fs.ContentSummary;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.HarFileSystem;
import org.apache.hadoop.fs.Path;
/**
* HiveHarFileSystem - fixes issues with Hadoop's HarFileSystem
*
*/
public class HiveHarFileSystem extends HarFileSystem {
@Override
public BlockLocation[] getFileBlockLocations(FileStatus file, long start,
long len) throws IOException {
// In some places (e.g. FileInputFormat) this BlockLocation is used to
// figure out sizes/offsets and so a completely blank one will not work.
String [] hosts = {"DUMMY_HOST"};
return new BlockLocation[]{new BlockLocation(null, hosts, 0, file.getLen())};
}
@Override
public ContentSummary getContentSummary(Path f) throws IOException {
// HarFileSystem has a bug where this method does not work properly
// if the underlying FS is HDFS. See MAPREDUCE-1877 for more
// information. This method is from FileSystem.
FileStatus status = getFileStatus(f);
if (!status.isDir()) {
// f is a file
return new ContentSummary(status.getLen(), 1, 0);
}
// f is a directory
long[] summary = {0, 0, 1};
for(FileStatus s : listStatus(f)) {
ContentSummary c = s.isDir() ? getContentSummary(s.getPath()) :
new ContentSummary(s.getLen(), 1, 0);
summary[0] += c.getLength();
summary[1] += c.getFileCount();
summary[2] += c.getDirectoryCount();
}
return new ContentSummary(summary[0], summary[1], summary[2]);
}
}