org.apache.avro.tool.TetherTool.java Source code

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Here is the source code for org.apache.avro.tool.TetherTool.java

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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.avro.tool;

import java.io.File;
import java.io.InputStream;
import java.io.PrintStream;
import java.util.List;

import joptsimple.OptionParser;
import joptsimple.OptionSet;
import joptsimple.OptionSpec;

import org.apache.avro.Schema;
import org.apache.avro.mapred.AvroJob;
import org.apache.avro.mapred.tether.TetherJob;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobConf;

@SuppressWarnings("deprecation")
public class TetherTool implements Tool {
    public TetherJob job;

    @Override
    public String getName() {
        return "tether";
    }

    @Override
    public String getShortDescription() {
        return "Run a tethered mapreduce job.";
    }

    @Override
    public int run(InputStream ins, PrintStream outs, PrintStream err, List<String> args) throws Exception {

        OptionParser p = new OptionParser();
        OptionSpec<File> exec = p.accepts("program", "executable program, usually in HDFS").withRequiredArg()
                .ofType(File.class);
        OptionSpec<String> in = p.accepts("in", "comma-separated input paths").withRequiredArg()
                .ofType(String.class);
        OptionSpec<Path> out = p.accepts("out", "output directory").withRequiredArg().ofType(Path.class);
        OptionSpec<File> outSchema = p.accepts("outschema", "output schema file").withRequiredArg()
                .ofType(File.class);
        OptionSpec<File> mapOutSchema = p.accepts("outschemamap", "map output schema file, if different")
                .withOptionalArg().ofType(File.class);
        OptionSpec<Integer> reduces = p.accepts("reduces", "number of reduces").withOptionalArg()
                .ofType(Integer.class);

        JobConf job = new JobConf();

        try {
            OptionSet opts = p.parse(args.toArray(new String[0]));
            FileInputFormat.addInputPaths(job, in.value(opts));
            FileOutputFormat.setOutputPath(job, out.value(opts));
            TetherJob.setExecutable(job, exec.value(opts));
            job.set(AvroJob.OUTPUT_SCHEMA, Schema.parse(outSchema.value(opts)).toString());
            if (opts.hasArgument(mapOutSchema))
                job.set(AvroJob.MAP_OUTPUT_SCHEMA, Schema.parse(mapOutSchema.value(opts)).toString());
            if (opts.hasArgument(reduces))
                job.setNumReduceTasks(reduces.value(opts));
        } catch (Exception e) {
            p.printHelpOn(err);
            return -1;
        }

        TetherJob.runJob(job);
        return 0;
    }

}