org.apache.hadoop.hive.common.HiveStatsUtils 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.common;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
/**
* HiveStatsUtils.
* A collection of utilities used for hive statistics.
* Used by classes in both metastore and ql package
*/
public class HiveStatsUtils {
/**
* Get all file status from a root path and recursively go deep into certain levels.
*
* @param path
* the root path
* @param level
* the depth of directory to explore
* @param fs
* the file system
* @return array of FileStatus
* @throws IOException
*/
public static FileStatus[] getFileStatusRecurse(Path path, int level, FileSystem fs)
throws IOException {
// if level is <0, the return all files/directories under the specified path
if ( level < 0) {
List result = new ArrayList();
try {
FileStatus fileStatus = fs.getFileStatus(path);
FileUtils.listStatusRecursively(fs, fileStatus, result);
} catch (IOException e) {
// globStatus() API returns empty FileStatus[] when the specified path
// does not exist. But getFileStatus() throw IOException. To mimic the
// similar behavior we will return empty array on exception. For external
// tables, the path of the table will not exists during table creation
return new FileStatus[0];
}
return result.toArray(new FileStatus[result.size()]);
}
// construct a path pattern (e.g., /*/*) to find all dynamically generated paths
StringBuilder sb = new StringBuilder(path.toUri().getPath());
for (int i = 0; i < level; i++) {
sb.append(Path.SEPARATOR).append("*");
}
Path pathPattern = new Path(path, sb.toString());
return fs.globStatus(pathPattern, FileUtils.HIDDEN_FILES_PATH_FILTER);
}
}