/**
* 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.sqoop.util;
import java.io.IOException;
import java.io.File;
import java.net.InetAddress;
import java.net.UnknownHostException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.compress.CompressionCodec;
import org.apache.hadoop.io.compress.GzipCodec;
import org.apache.hadoop.conf.Configuration;
import com.cloudera.sqoop.SqoopOptions;
import com.cloudera.sqoop.io.CodecMap;
import com.cloudera.sqoop.io.SplittingOutputStream;
import com.cloudera.sqoop.io.SplittableBufferedWriter;
import org.apache.hadoop.util.Shell;
import com.cloudera.sqoop.manager.ImportJobContext;
/**
* Utility methods that are common to various the direct import managers.
*/
public final class DirectImportUtils {
public static final Log LOG = LogFactory.getLog(
DirectImportUtils.class.getName());
private DirectImportUtils() {
}
/**
* Executes chmod on the specified file, passing in the mode string 'modstr'
* which may be e.g. "a+x" or "0600", etc.
* @throws IOException if chmod failed.
*/
public static void setFilePermissions(File file, String modstr)
throws IOException {
// Set this file to be 0600. Java doesn't have a built-in mechanism for this
// so we need to go out to the shell to execute chmod.
try {
Shell.execCommand("chmod", modstr, file.toString());
} catch (IOException ioe) {
// Shell.execCommand will throw IOException on exit code != 0.
LOG.error("Could not chmod " + modstr + " " + file.toString());
throw new IOException("Could not ensure password file security.", ioe);
}
}
/**
* Open a file in HDFS for write to hold the data associated with a table.
* Creates any necessary directories, and returns the OutputStream to write
* to. The caller is responsible for calling the close() method on the
* returned stream.
*/
public static SplittableBufferedWriter createHdfsSink(Configuration conf,
SqoopOptions options, ImportJobContext context) throws IOException {
Path destDir = context.getDestination();
FileSystem fs = destDir.getFileSystem(conf);
LOG.debug("Writing to filesystem: " + fs.getUri());
LOG.debug("Creating destination directory " + destDir);
fs.mkdirs(destDir);
// This Writer will be closed by the caller.
return new SplittableBufferedWriter(
new SplittingOutputStream(conf, destDir, "data-",
options.getDirectSplitSize(), getCodec(conf, options)));
}
private static CompressionCodec getCodec(Configuration conf,
SqoopOptions options) throws IOException {
if (options.shouldUseCompression()) {
if (options.getCompressionCodec() == null) {
return new GzipCodec();
} else {
return CodecMap.getCodec(options.getCompressionCodec(), conf);
}
}
return null;
}
/** @return true if someHost refers to localhost.
*/
public static boolean isLocalhost(String someHost) {
if (null == someHost) {
return false;
}
try {
InetAddress localHostAddr = InetAddress.getLocalHost();
InetAddress someAddr = InetAddress.getByName(someHost);
return localHostAddr.equals(someAddr);
} catch (UnknownHostException uhe) {
return false;
}
}
}