Ingest To HDFS using apache beam - Java Big Data

Java examples for Big Data:HDF

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Description

Ingest To HDFS using apache beam

Demo Code

/*// w  w  w.j  av  a 2  s . c o  m
 * 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
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 * "License"); you may not use this file except in compliance
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package org.apache.beam.samples.ingest;

import org.apache.beam.sdk.Pipeline;
import org.apache.beam.sdk.io.TextIO;
import org.apache.beam.sdk.io.Write;
import org.apache.beam.sdk.io.hdfs.HDFSFileSink;
import org.apache.beam.sdk.options.Default;
import org.apache.beam.sdk.options.DefaultValueFactory;
import org.apache.beam.sdk.options.Description;
import org.apache.beam.sdk.options.PipelineOptions;
import org.apache.beam.sdk.options.PipelineOptionsFactory;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.text.SimpleDateFormat;
import java.util.Date;

public class IngestToHDFS {

    private static final Logger LOG = LoggerFactory
            .getLogger(IngestToHDFS.class);

    /**
     * Specific pipeline options.
     */
    private interface Options extends PipelineOptions {
        String GDELT_EVENTS_URL = "http://data.gdeltproject.org/events/";

        @Description("GDELT file date")
        @Default.InstanceFactory(Options.GDELTFileFactory.class)
        String getDate();

        void setDate(String value);

        @Description("Input Path")
        String getInput();

        void setInput(String value);

        @Description("Output Path")
        String getOutput();

        void setOutput(String value);

        class GDELTFileFactory implements DefaultValueFactory<String> {
            public String create(PipelineOptions options) {
                SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");
                return format.format(new Date());
            }
        }
    }

    public static void main(String[] args) {
        Options options = PipelineOptionsFactory.fromArgs(args)
                .withValidation().as(Options.class);
        if (options.getInput() == null) {
            options.setInput(Options.GDELT_EVENTS_URL + options.getDate()
                    + ".export.CSV.zip");
        }
        LOG.info(options.toString());

        Pipeline pipeline = Pipeline.create(options);
        //TODO: Change for HadoopIO once it is ready
        pipeline.apply("ReadFromGDELTFile",
                TextIO.Read.from(options.getInput())).apply(
                "WriteToHDFS",
                Write.to(new HDFSFileSink(options.getOutput(),
                        TextOutputFormat.class)));
        pipeline.run();
    }
}

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