/**
* 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;
import java.util.Arrays;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import com.cloudera.sqoop.SqoopOptions;
import com.cloudera.sqoop.cli.ToolOptions;
import com.cloudera.sqoop.tool.SqoopTool;
import com.cloudera.sqoop.util.OptionsFileUtil;
/**
* Main entry-point for Sqoop
* Usage: hadoop jar (this_jar_name) com.cloudera.sqoop.Sqoop (options)
* See the SqoopOptions class for options.
*/
public class Sqoop extends Configured implements Tool {
public static final Log SQOOP_LOG = LogFactory.getLog("com.cloudera.sqoop");
public static final Log LOG = LogFactory.getLog(Sqoop.class.getName());
/**
* If this System property is set, always throw an exception, do not just
* exit with status 1.
*/
public static final String SQOOP_RETHROW_PROPERTY = "sqoop.throwOnError";
/**
* The option to specify an options file from which other options to the
* tool are read.
*/
public static final String SQOOP_OPTIONS_FILE_SPECIFIER = "--options-file";
static {
Configuration.addDefaultResource("sqoop-site.xml");
}
private SqoopTool tool;
private SqoopOptions options;
private String [] childPrgmArgs;
/**
* Creates a new instance of Sqoop set to run the supplied SqoopTool
* with the default configuration.
* @param tool the SqoopTool to run in the main body of Sqoop.
*/
public Sqoop(SqoopTool tool) {
this(tool, (Configuration) null);
}
/**
* Creates a new instance of Sqoop set to run the supplied SqoopTool
* with the provided configuration.
* @param tool the SqoopTool to run in the main body of Sqoop.
* @param conf the Configuration to use (e.g., from ToolRunner).
*/
public Sqoop(SqoopTool tool, Configuration conf) {
this(tool, conf, new SqoopOptions());
}
/**
* Creates a new instance of Sqoop set to run the supplied SqoopTool
* with the provided configuration and SqoopOptions.
* @param tool the SqoopTool to run in the main body of Sqoop.
* @param conf the Configuration to use (e.g., from ToolRunner).
* @param opts the SqoopOptions which control the tool's parameters.
*/
public Sqoop(SqoopTool tool, Configuration conf, SqoopOptions opts) {
LOG.info("Running Sqoop version: " + new SqoopVersion().VERSION);
if (null != conf) {
setConf(conf);
}
this.options = opts;
this.options.setConf(getConf());
this.tool = tool;
}
/**
* @return the SqoopOptions used in this Sqoop instance.
*/
public SqoopOptions getOptions() {
return this.options;
}
/**
* @return the SqoopTool used in this Sqoop instance.
*/
public SqoopTool getTool() {
return this.tool;
}
@Override
/**
* Actual main entry-point for the program
*/
public int run(String [] args) {
if (options.getConf() == null) {
// Configuration wasn't initialized until after the ToolRunner
// got us to this point. ToolRunner gave Sqoop itself a Conf
// though.
options.setConf(getConf());
}
try {
options = tool.parseArguments(args, null, options, false);
tool.appendArgs(this.childPrgmArgs);
tool.validateOptions(options);
} catch (Exception e) {
// Couldn't parse arguments.
// Log the stack trace for this exception
LOG.debug(e.getMessage(), e);
// Print exception message.
System.err.println(e.getMessage());
return 1; // Exit on exception here.
}
return tool.run(options);
}
/**
* SqoopTools sometimes pass arguments to a child program (e.g., mysqldump).
* Users can specify additional args to these programs by preceeding the
* additional arguments with a standalone '--'; but
* ToolRunner/GenericOptionsParser will cull out this argument. We remove
* the child-program arguments in advance, and store them to be readded
* later.
* @param argv the argv in to the SqoopTool
* @return the argv with a "--" and any subsequent arguments removed.
*/
private String [] stashChildPrgmArgs(String [] argv) {
for (int i = 0; i < argv.length; i++) {
if ("--".equals(argv[i])) {
this.childPrgmArgs = Arrays.copyOfRange(argv, i, argv.length);
return Arrays.copyOfRange(argv, 0, i);
}
}
// Didn't find child-program arguments.
return argv;
}
/**
* Given a Sqoop object and a set of arguments to deliver to
* its embedded SqoopTool, run the tool, wrapping the call to
* ToolRunner.
* This entry-point is preferred to ToolRunner.run() because
* it has a chance to stash child program arguments before
* GenericOptionsParser would remove them.
*/
public static int runSqoop(Sqoop sqoop, String [] args) {
try {
String [] toolArgs = sqoop.stashChildPrgmArgs(args);
return ToolRunner.run(sqoop.getConf(), sqoop, toolArgs);
} catch (Exception e) {
LOG.error("Got exception running Sqoop: " + e.toString());
e.printStackTrace();
if (System.getProperty(SQOOP_RETHROW_PROPERTY) != null) {
throw new RuntimeException(e);
}
return 1;
}
}
/**
* Entry-point that parses the correct SqoopTool to use from the args,
* but does not call System.exit() as main() will.
*/
public static int runTool(String [] args, Configuration conf) {
// Expand the options
String[] expandedArgs = null;
try {
expandedArgs = OptionsFileUtil.expandArguments(args);
} catch (Exception ex) {
LOG.error("Error while expanding arguments", ex);
System.err.println(ex.getMessage());
System.err.println("Try 'sqoop help' for usage.");
return 1;
}
String toolName = expandedArgs[0];
Configuration pluginConf = SqoopTool.loadPlugins(conf);
SqoopTool tool = SqoopTool.getTool(toolName);
if (null == tool) {
System.err.println("No such sqoop tool: " + toolName
+ ". See 'sqoop help'.");
return 1;
}
Sqoop sqoop = new Sqoop(tool, pluginConf);
return runSqoop(sqoop,
Arrays.copyOfRange(expandedArgs, 1, expandedArgs.length));
}
/**
* Entry-point that parses the correct SqoopTool to use from the args,
* but does not call System.exit() as main() will.
*/
public static int runTool(String [] args) {
return runTool(args, new Configuration());
}
public static void main(String [] args) {
if (args.length == 0) {
System.err.println("Try 'sqoop help' for usage.");
System.exit(1);
}
int ret = runTool(args);
System.exit(ret);
}
}