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/*
* 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.hudi.common.util;
import org.apache.hudi.exception.HoodieIOException;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintStream;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;
/**
* Bunch of utility methods for working with files and byte streams.
*/
public class FileIOUtils {
public static final Logger LOG = LoggerFactory.getLogger(FileIOUtils.class);
public static final long KB = 1024;
public static void deleteDirectory(File directory) throws IOException {
if (directory.exists()) {
Files.walk(directory.toPath()).sorted(Comparator.reverseOrder()).map(Path::toFile).forEach(File::delete);
directory.delete();
if (directory.exists()) {
throw new IOException("Unable to delete directory " + directory);
}
}
}
public static void mkdir(File directory) throws IOException {
if (!directory.exists()) {
directory.mkdirs();
}
if (!directory.isDirectory()) {
throw new IOException("Unable to create :" + directory);
}
}
public static String readAsUTFString(InputStream input) throws IOException {
return readAsUTFString(input, 128);
}
public static String readAsUTFString(InputStream input, int length) throws IOException {
ByteArrayOutputStream bos = new ByteArrayOutputStream(length);
copy(input, bos);
return new String(bos.toByteArray(), StandardCharsets.UTF_8);
}
/**
* Reads the input stream into String lines.
*
* @param input {@code InputStream} instance.
* @return String lines in a list.
*/
public static List readAsUTFStringLines(InputStream input) {
List lines = new ArrayList<>();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(input, StandardCharsets.UTF_8));
lines = bufferedReader.lines().collect(Collectors.toList());
closeQuietly(bufferedReader);
return lines;
}
public static void copy(InputStream inputStream, OutputStream outputStream) throws IOException {
byte[] buffer = new byte[1024];
int len;
while ((len = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, len);
}
}
/**
* Copies the file content from source path to destination path.
*
* @param fileSystem {@link FileSystem} instance.
* @param sourceFilePath Source file path.
* @param destFilePath Destination file path.
*/
public static void copy(
FileSystem fileSystem, org.apache.hadoop.fs.Path sourceFilePath,
org.apache.hadoop.fs.Path destFilePath) {
FSDataInputStream fsDataInputStream = null;
FSDataOutputStream fsDataOutputStream = null;
try {
fsDataInputStream = fileSystem.open(sourceFilePath);
fsDataOutputStream = fileSystem.create(destFilePath, false);
copy(fsDataInputStream, fsDataOutputStream);
} catch (IOException e) {
throw new HoodieIOException(String.format("Cannot copy from %s to %s",
sourceFilePath.toString(), destFilePath.toString()), e);
} finally {
closeQuietly(fsDataInputStream);
closeQuietly(fsDataOutputStream);
}
}
public static byte[] readAsByteArray(InputStream input) throws IOException {
return readAsByteArray(input, 128);
}
public static byte[] readAsByteArray(InputStream input, int outputSize) throws IOException {
ByteArrayOutputStream bos = new ByteArrayOutputStream(outputSize);
copy(input, bos);
return bos.toByteArray();
}
public static void writeStringToFile(String str, String filePath) throws IOException {
PrintStream out = new PrintStream(new FileOutputStream(filePath));
out.println(str);
out.flush();
out.close();
}
/**
* Closes {@code Closeable} quietly.
*
* @param closeable {@code Closeable} to close
*/
public static void closeQuietly(Closeable closeable) {
if (closeable == null) {
return;
}
try {
closeable.close();
} catch (IOException e) {
LOG.warn("IOException during close", e);
}
}
public static void createFileInPath(FileSystem fileSystem, org.apache.hadoop.fs.Path fullPath, Option content, boolean ignoreIOE) {
try {
// If the path does not exist, create it first
if (!fileSystem.exists(fullPath)) {
if (fileSystem.createNewFile(fullPath)) {
LOG.info("Created a new file in meta path: " + fullPath);
} else {
throw new HoodieIOException("Failed to create file " + fullPath);
}
}
if (content.isPresent()) {
FSDataOutputStream fsout = fileSystem.create(fullPath, true);
fsout.write(content.get());
fsout.close();
}
} catch (IOException e) {
LOG.warn("Failed to create file " + fullPath, e);
if (!ignoreIOE) {
throw new HoodieIOException("Failed to create file " + fullPath, e);
}
}
}
public static void createFileInPath(FileSystem fileSystem, org.apache.hadoop.fs.Path fullPath, Option content) {
createFileInPath(fileSystem, fullPath, content, false);
}
public static Option readDataFromPath(FileSystem fileSystem, org.apache.hadoop.fs.Path detailPath, boolean ignoreIOE) {
try (FSDataInputStream is = fileSystem.open(detailPath)) {
return Option.of(FileIOUtils.readAsByteArray(is));
} catch (IOException e) {
LOG.warn("Could not read commit details from " + detailPath, e);
if (!ignoreIOE) {
throw new HoodieIOException("Could not read commit details from " + detailPath, e);
}
return Option.empty();
}
}
public static Option readDataFromPath(FileSystem fileSystem, org.apache.hadoop.fs.Path detailPath) {
return readDataFromPath(fileSystem, detailPath, false);
}
/**
* Return the configured local directories where hudi can write files. This
* method does not create any directories on its own, it only encapsulates the
* logic of locating the local directories according to deployment mode.
*/
public static String[] getConfiguredLocalDirs() {
if (isRunningInYarnContainer()) {
// If we are in yarn mode, systems can have different disk layouts so we must set it
// to what Yarn on this system said was available. Note this assumes that Yarn has
// created the directories already, and that they are secured so that only the
// user has access to them.
return getYarnLocalDirs().split(",");
} else if (System.getProperty("java.io.tmpdir") != null) {
return System.getProperty("java.io.tmpdir").split(",");
} else {
return null;
}
}
private static boolean isRunningInYarnContainer() {
// These environment variables are set by YARN.
return System.getenv("CONTAINER_ID") != null
&& System.getenv("LOCAL_DIRS") != null;
}
/**
* Get the Yarn approved local directories.
*/
private static String getYarnLocalDirs() {
String localDirs = System.getenv("LOCAL_DIRS");
if (localDirs == null) {
throw new HoodieIOException("Yarn Local dirs can't be empty");
}
return localDirs;
}
}
