/**
* 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.net.URI;
import java.util.BitSet;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.util.Shell.ShellCommandExecutor;
/**
* Collection of file manipulation utilities common across Hive.
*/
public final class FileUtils {
/**
* Variant of Path.makeQualified that qualifies the input path against the default file system
* indicated by the configuration
*
* This does not require a FileSystem handle in most cases - only requires the Filesystem URI.
* This saves the cost of opening the Filesystem - which can involve RPCs - as well as cause
* errors
*
* @param path
* path to be fully qualified
* @param conf
* Configuration file
* @return path qualified relative to default file system
*/
public static Path makeQualified(Path path, Configuration conf) throws IOException {
if (!path.isAbsolute()) {
// in this case we need to get the working directory
// and this requires a FileSystem handle. So revert to
// original method.
return path.makeQualified(FileSystem.get(conf));
}
URI fsUri = FileSystem.getDefaultUri(conf);
URI pathUri = path.toUri();
String scheme = pathUri.getScheme();
String authority = pathUri.getAuthority();
// validate/fill-in scheme and authority. this follows logic
// identical to FileSystem.get(URI, conf) - but doesn't actually
// obtain a file system handle
if (scheme == null) {
// no scheme - use default file system uri
scheme = fsUri.getScheme();
authority = fsUri.getAuthority();
if (authority == null) {
authority = "";
}
} else {
if (authority == null) {
// no authority - use default one if it applies
if (scheme.equals(fsUri.getScheme()) && fsUri.getAuthority() != null) {
authority = fsUri.getAuthority();
} else {
authority = "";
}
}
}
return new Path(scheme, authority, pathUri.getPath());
}
private FileUtils() {
// prevent instantiation
}
public static String makePartName(List<String> partCols, List<String> vals) {
return makePartName(partCols, vals, null);
}
/**
* Makes a valid partition name.
* @param partCols The partition keys' names
* @param vals The partition values
* @param defaultStr
* The default name given to a partition value if the respective value is empty or null.
* @return An escaped, valid partition name.
*/
public static String makePartName(List<String> partCols, List<String> vals,
String defaultStr) {
StringBuilder name = new StringBuilder();
for (int i = 0; i < partCols.size(); i++) {
if (i > 0) {
name.append(Path.SEPARATOR);
}
name.append(escapePathName((partCols.get(i)).toLowerCase(), defaultStr));
name.append('=');
name.append(escapePathName(vals.get(i), defaultStr));
}
return name.toString();
}
// NOTE: This is for generating the internal path name for partitions. Users
// should always use the MetaStore API to get the path name for a partition.
// Users should not directly take partition values and turn it into a path
// name by themselves, because the logic below may change in the future.
//
// In the future, it's OK to add new chars to the escape list, and old data
// won't be corrupt, because the full path name in metastore is stored.
// In that case, Hive will continue to read the old data, but when it creates
// new partitions, it will use new names.
static BitSet charToEscape = new BitSet(128);
static {
for (char c = 0; c < ' '; c++) {
charToEscape.set(c);
}
/**
* ASCII 01-1F are HTTP control characters that need to be escaped.
* \u000A and \u000D are \n and \r, respectively.
*/
char[] clist = new char[] {'\u0001', '\u0002', '\u0003', '\u0004',
'\u0005', '\u0006', '\u0007', '\u0008', '\u0009', '\n', '\u000B',
'\u000C', '\r', '\u000E', '\u000F', '\u0010', '\u0011', '\u0012',
'\u0013', '\u0014', '\u0015', '\u0016', '\u0017', '\u0018', '\u0019',
'\u001A', '\u001B', '\u001C', '\u001D', '\u001E', '\u001F',
'"', '#', '%', '\'', '*', '/', ':', '=', '?', '\\', '\u007F', '{',
'[', ']'};
for (char c : clist) {
charToEscape.set(c);
}
}
static boolean needsEscaping(char c) {
return c >= 0 && c < charToEscape.size() && charToEscape.get(c);
}
public static String escapePathName(String path) {
return escapePathName(path, null);
}
/**
* Escapes a path name.
* @param path The path to escape.
* @param defaultPath
* The default name for the path, if the given path is empty or null.
* @return An escaped path name.
*/
public static String escapePathName(String path, String defaultPath) {
// __HIVE_DEFAULT_NULL__ is the system default value for null and empty string.
// TODO: we should allow user to specify default partition or HDFS file location.
if (path == null || path.length() == 0) {
if (defaultPath == null) {
//previously, when path is empty or null and no default path is specified,
// __HIVE_DEFAULT_PARTITION__ was the return value for escapePathName
return "__HIVE_DEFAULT_PARTITION__";
} else {
return defaultPath;
}
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < path.length(); i++) {
char c = path.charAt(i);
if (needsEscaping(c)) {
sb.append('%');
sb.append(String.format("%1$02X", (int) c));
} else {
sb.append(c);
}
}
return sb.toString();
}
public static String unescapePathName(String path) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < path.length(); i++) {
char c = path.charAt(i);
if (c == '%' && i + 2 < path.length()) {
int code = -1;
try {
code = Integer.valueOf(path.substring(i + 1, i + 3), 16);
} catch (Exception e) {
code = -1;
}
if (code >= 0) {
sb.append((char) code);
i += 2;
continue;
}
}
sb.append(c);
}
return sb.toString();
}
/**
* Recursively lists status for all files starting from a particular directory (or individual file
* as base case).
*
* @param fs
* file system
*
* @param fileStatus
* starting point in file system
*
* @param results
* receives enumeration of all files found
*/
public static void listStatusRecursively(FileSystem fs, FileStatus fileStatus,
List<FileStatus> results) throws IOException {
if (fileStatus.isDir()) {
for (FileStatus stat : fs.listStatus(fileStatus.getPath())) {
listStatusRecursively(fs, stat, results);
}
} else {
results.add(fileStatus);
}
}
/**
* Archive all the files in the inputFiles into outputFile
*
* @param inputFiles
* @param outputFile
* @throws IOException
*/
public static void tar(String parentDir, String[] inputFiles, String outputFile)
throws IOException {
StringBuffer tarCommand = new StringBuffer();
tarCommand.append("cd " + parentDir + " ; ");
tarCommand.append(" tar -zcvf ");
tarCommand.append(" " + outputFile);
for (int i = 0; i < inputFiles.length; i++) {
tarCommand.append(" " + inputFiles[i]);
}
String[] shellCmd = {"bash", "-c", tarCommand.toString()};
ShellCommandExecutor shexec = new ShellCommandExecutor(shellCmd);
shexec.execute();
int exitcode = shexec.getExitCode();
if (exitcode != 0) {
throw new IOException("Error tarring file " + outputFile
+ ". Tar process exited with exit code " + exitcode);
}
}
}