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    <p>I think as you are trying to output NULL as key from the map so you can use NullWritable. So your code would be something as below:-</p> <pre><code>import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.IntWritable; import org.apache.hadoop.io.LongWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Job; import org.apache.hadoop.mapreduce.Mapper; import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; import org.apache.hadoop.util.GenericOptionsParser; public class ParseDataToDB { public static final String SEPARATOR_FIELD = new String(new char[] {1}); public static final String SEPARATOR_ARRAY_VALUE = new String(new char[] {2}); public static class MyMapper extends Mapper&lt;LongWritable, Text, NullWritable, Text&gt; { //private final static IntWritable one = new IntWritable(1); private Text word = new Text(); private ArrayList&lt;String&gt; bazValues = new ArrayList&lt;String&gt;(); public void map(LongWritable key, Text value, OutputCollector&lt;NullWritable, Text&gt; context) throws IOException { String line = value.toString(); StringTokenizer tokenizer = new StringTokenizer(line); while(tokenizer.hasMoreTokens()){ word.set(tokenizer.nextToken()); if(word.find("extract") &gt; -1) { System.out.println("in herer"); bazValues.add(line); } } // Build up the array values as a delimited string. StringBuilder bazValueBuilder = new StringBuilder(); int i = 0; for (String bazValue : bazValues) { bazValueBuilder.append(bazValue); ++i; if (i &lt; bazValues.size()) { bazValueBuilder.append(SEPARATOR_ARRAY_VALUE); } } // Build up the column values / fields as a delimited string. String hiveRow = new String(); hiveRow += "fooValue"; hiveRow += SEPARATOR_FIELD; hiveRow += "barValue"; hiveRow += SEPARATOR_FIELD; hiveRow += bazValueBuilder.toString(); System.out.println("in herer hiveRow" + hiveRow); // Emit a null key and a Text object containing the delimited fields context.collect(NullWritable.get(), new Text(hiveRow)); } } public static void main(String[] args) throws IOException, InterruptedException, ClassNotFoundException { Configuration conf = new Configuration(); String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs(); Job job = new Job(conf, "MyTest"); job.setJarByClass(ParseDataToDB.class); job.setMapperClass(MyMapper.class); job.setMapOutputKeyClass(NullWritable.class); job.setMapOutputValueClass(Text.class); job.setOutputKeyClass(NullWritable.class); job.setOutputValueClass(Text.class); FileInputFormat.addInputPath(job, new Path(otherArgs[0])); FileOutputFormat.setOutputPath(job, new Path(otherArgs[1])); System.exit(job.waitForCompletion(true) ? 0 : 1); } </code></pre> <p>}</p>
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    1. POParsing and writing log data from mapreduce to hive
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    1. USBinary01
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