io.fluo.mapreduce.FluoOutputFormat.java Source code

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Here is the source code for io.fluo.mapreduce.FluoOutputFormat.java

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/*
 * Copyright 2014 Fluo authors (see AUTHORS)
 *
 * Licensed 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 io.fluo.mapreduce;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Properties;

import io.fluo.api.client.Loader;
import io.fluo.api.config.FluoConfiguration;
import io.fluo.core.client.LoaderExecutorImpl;
import org.apache.commons.configuration.ConfigurationConverter;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.OutputCommitter;
import org.apache.hadoop.mapreduce.OutputFormat;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;

/**
 * This output format enables the execution of load transaction against a Fluo table using map reduce.
 */
public class FluoOutputFormat extends OutputFormat<Loader, NullWritable> {

    private static String PROPS_CONF_KEY = FluoOutputFormat.class.getName() + ".props";

    @Override
    public void checkOutputSpecs(JobContext arg0) throws IOException, InterruptedException {
        // TODO Auto-generated method stub

    }

    @Override
    public OutputCommitter getOutputCommitter(TaskAttemptContext arg0) throws IOException, InterruptedException {
        return new OutputCommitter() {

            @Override
            public void setupTask(TaskAttemptContext context) throws IOException {
            }

            @Override
            public void setupJob(JobContext context) throws IOException {

            }

            @Override
            public boolean needsTaskCommit(TaskAttemptContext arg0) throws IOException {
                return false;
            }

            @Override
            public void commitTask(TaskAttemptContext context) throws IOException {
            }

            @Override
            public void abortTask(TaskAttemptContext context) throws IOException {
            }
        };
    }

    @Override
    public RecordWriter<Loader, NullWritable> getRecordWriter(TaskAttemptContext context)
            throws IOException, InterruptedException {

        ByteArrayInputStream bais = new ByteArrayInputStream(
                context.getConfiguration().get(PROPS_CONF_KEY).getBytes("UTF-8"));
        Properties props = new Properties();
        props.load(bais);

        FluoConfiguration config = new FluoConfiguration(ConfigurationConverter.getConfiguration(props));

        try (final LoaderExecutorImpl lexecutor = new LoaderExecutorImpl(config)) {
            return new RecordWriter<Loader, NullWritable>() {

                @Override
                public void close(TaskAttemptContext conext) throws IOException, InterruptedException {
                    lexecutor.close();
                }

                @Override
                public void write(Loader loader, NullWritable nullw) throws IOException, InterruptedException {
                    lexecutor.execute(loader);
                }
            };
        } catch (Exception e) {
            throw new IOException(e);
        }
    }

    /**
     * Call this method to initialize the Fluo connection props and {@link LoaderExecutorImpl} props
     * 
     * @param conf
     * @param props
     *          Use {@link io.fluo.api.config.FluoConfiguration} to set props programmatically
     */

    public static void configure(Job conf, Properties props) {
        try {

            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            props.store(baos, "");

            conf.getConfiguration().set(PROPS_CONF_KEY, new String(baos.toByteArray(), "UTF8"));

        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}