Hi
Are you sure job1 created output where you expected it and in the format you
expect? Have you tested job2 on its own with some hand-crafted test data? Is
the output from job1 consistent with your hand-crafted test data for job2?
regards
On 25 Oct 2013, at 06:46, Anseh Danesh <anseh.dan...@gmail.com> wrote:
> Hi all.
> I have a mapreduce program with two jobs. second job's key and value comes
> from first job output. but I think the second map does not get the result
> from first job. in other words I think my second job did not read the output
> of my first job.. what should I do?
>
> here is the code:
>
> public class dewpoint extends Configured implements Tool
> {
> private static final Logger logger =
> LoggerFactory.getLogger(dewpoint.class);
>
> static final String KEYSPACE = "weather";
> static final String COLUMN_FAMILY = "user";
> private static final String OUTPUT_PATH1 = "/tmp/intermediate1";
> private static final String OUTPUT_PATH2 = "/tmp/intermediate2";
> private static final String OUTPUT_PATH3 = "/tmp/intermediate3";
> private static final String INPUT_PATH1 = "/tmp/intermediate1";
>
> public static void main(String[] args) throws Exception
> {
>
> ToolRunner.run(new Configuration(), new dewpoint(), args);
> System.exit(0);
> }
>
> ///////////////////////////////////////////////////////////
>
> public static class dpmap1 extends Mapper<Map<String, ByteBuffer>,
> Map<FloatWritable, ByteBuffer>, Text, DoubleWritable>
> {
> DoubleWritable val1 = new DoubleWritable();
> Text word = new Text();
> String date;
> float temp;
> public void map(Map<String, ByteBuffer> keys, Map<FloatWritable,
> ByteBuffer> columns, Context context) throws IOException, InterruptedException
> {
>
> for (Entry<String, ByteBuffer> key : keys.entrySet())
> {
> //System.out.println(key.getKey());
> if (!"date".equals(key.getKey()))
> continue;
> date = ByteBufferUtil.string(key.getValue());
> word.set(date);
> }
>
>
> for (Entry<FloatWritable, ByteBuffer> column : columns.entrySet())
> {
> if (!"temprature".equals(column.getKey()))
> continue;
> temp = ByteBufferUtil.toFloat(column.getValue());
> val1.set(temp);
> //System.out.println(temp);
> }
> context.write(word, val1);
> }
> }
>
> ///////////////////////////////////////////////////////////
>
> public static class dpred1 extends Reducer<Text, DoubleWritable, Text,
> DoubleWritable>
> {
> public void reduce(Text key, Iterable<DoubleWritable> values, Context
> context) throws IOException, InterruptedException
> {
> double beta = 17.62;
> double landa = 243.12;
> DoubleWritable result1 = new DoubleWritable();
> DoubleWritable result2 = new DoubleWritable();
> for (DoubleWritable val : values){
> // System.out.println(val.get());
> beta *= val.get();
> landa+=val.get();
> }
> result1.set(beta);
> result2.set(landa);
>
> context.write(key, result1);
> context.write(key, result2);
> }
> }
> ///////////////////////////////////////////////////////////
>
> public static class dpmap2 extends Mapper <Text, DoubleWritable, Text,
> DoubleWritable>{
>
> Text key2 = new Text();
> double temp1, temp2 =0;
>
> public void map(Text key, Iterable<DoubleWritable> values, Context
> context) throws IOException, InterruptedException {
> String[] sp = values.toString().split("\t");
> for (int i=0; i< sp.length; i+=4)
> //key2.set(sp[i]);
> System.out.println(sp[i]);
> for(int j=1;j< sp.length; j+=4)
> temp1 = Double.valueOf(sp[j]);
> for (int k=3;k< sp.length; k+=4)
> temp2 = Double.valueOf(sp[k]);
> context.write(key2, new DoubleWritable(temp2/temp1));
>
> }
> }
>
> ///////////////////////////////////////////////////////////
>
>
> public static class dpred2 extends Reducer<Text, DoubleWritable, Text,
> DoubleWritable>
> {
> public void reduce(Text key, Iterable<DoubleWritable> values, Context
> context) throws IOException, InterruptedException
> {
>
> double alpha = 6.112;
> double tmp = 0;
> DoubleWritable result3 = new DoubleWritable();
> for (DoubleWritable val : values){
> System.out.println(val.get());
> tmp = alpha*(Math.pow(Math.E, val.get()));
>
> }
> result3.set(tmp);
> context.write(key, result3);
>
>
> }
> }
>
>
> ///////////////////////////////////////////////////////////
>
>
> public int run(String[] args) throws Exception
> {
>
> Job job1 = new Job(getConf(), "DewPoint");
> job1.setJarByClass(dewpoint.class);
> job1.setMapperClass(dpmap1.class);
> job1.setOutputFormatClass(SequenceFileOutputFormat.class);
> job1.setCombinerClass(dpred1.class);
> job1.setReducerClass(dpred1.class);
> job1.setMapOutputKeyClass(Text.class);
> job1.setMapOutputValueClass(DoubleWritable.class);
> job1.setOutputKeyClass(Text.class);
> job1.setOutputValueClass(DoubleWritable.class);
> FileOutputFormat.setOutputPath(job1, new Path(OUTPUT_PATH1));
>
>
> job1.setInputFormatClass(CqlPagingInputFormat.class);
>
> ConfigHelper.setInputRpcPort(job1.getConfiguration(), "9160");
> ConfigHelper.setInputInitialAddress(job1.getConfiguration(),
> "localhost");
> ConfigHelper.setInputColumnFamily(job1.getConfiguration(), KEYSPACE,
> COLUMN_FAMILY);
> ConfigHelper.setInputPartitioner(job1.getConfiguration(),
> "Murmur3Partitioner");
>
> CqlConfigHelper.setInputCQLPageRowSize(job1.getConfiguration(), "3");
> job1.waitForCompletion(true);
>
> /***************************************/
>
> if (job1.isSuccessful()){
> Job job2 = new Job(getConf(), "DewPoint");
> job2.setJarByClass(dewpoint.class);
> job2.setMapperClass(dpmap2.class);
> job2.setCombinerClass(dpred2.class);
> job2.setReducerClass(dpred2.class);
> job2.setMapOutputKeyClass(Text.class);
> job2.setMapOutputValueClass(DoubleWritable.class);
> job2.setOutputKeyClass(Text.class);
> job2.setOutputValueClass(DoubleWritable.class);
> job2.setOutputFormatClass(TextOutputFormat.class);
> job2.setInputFormatClass(SequenceFileInputFormat.class);
> FileInputFormat.addInputPath(job2, new Path(OUTPUT_PATH1));
> FileOutputFormat.setOutputPath(job2, new Path(OUTPUT_PATH2));
> job2.waitForCompletion(true);
> }
> ///////////////////////////////////////////////////
>
> return 0;
> }
> }
>
> for example in my second map phase when I do a System.out.println(key) it
> does not print any thing and in reduce result the value is 'infinity'....
