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POHadoop Map-Reduce . RecordReader
 

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    <p>I am trying to solve the following RecordReader problem . Example Input File :</p> <pre><code>1,1 2,2 3,3 4,4 5,5 6,6 7,7 ....... ....... </code></pre> <p>i want my RecordReader to return </p> <pre><code>key | Value 0 |1,1:2,2:3,3:4,4:5,5 4 |2,2:3,3:......6,6 6 |3,3:4,4......6,6,7,7 </code></pre> <p>(for first value first five line , for 2nd value five lines starting from 2nd line and for 3rd value five lines starting from 3rd line and so on )</p> <p><code>public class MyRecordReader extends RecordReader&lt;LongWritable, Text&gt; {</code></p> <pre><code>@Override public boolean nextKeyValue() throws IOException, InterruptedException { while (pos &lt; end) { key.set(pos); // five line logic Text nextLine=new Text(); int newSize = in.readLine(value, maxLineLength, Math.max((int)Math.min(Integer.MAX_VALUE, end-pos), maxLineLength)); fileSeek+=newSize; for(int n=0;n&lt;4;n++) { fileSeek+=in.readLine(nextLine, maxLineLength, Math.max((int)Math.min(Integer.MAX_VALUE, end-pos), maxLineLength)); value.append(":".getBytes(), 0,1); value.append(nextLine.getBytes(), 0, nextLine.getLength()); } if (newSize == 0) { return false; } pos += newSize; if (newSize &lt; maxLineLength) { return true; } // line too long. try again LOG.info("Skipped line of size " + newSize + " at pos " + (pos - newSize)); } return false; } </code></pre> <p>}</p> <p>But this is returning the values as </p> <pre><code>key | Value 0 |1,1:2,2:3,3:4,4:5,5 4 |6,6:7,7.......10,10 6 |11,11:12,12:......14,14 </code></pre> <p>can someone help me with this code or a fresh Code for RecodeReader will do as well ? <a href="https://stackoverflow.com/questions/12455088/how-to-calculate-centered-moving-average-of-a-set-on-data-hadoop-map-reduce">Requirement of the problem (may help you understand the use case)</a> Thanks </p>
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    1. USsaurabh shashank
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    1. COplease format the question properly, and show the output properly, then we might be able to answer...
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    2. CO@nyarlathotep : sry for bad format . il try to improve it , still u could hv helped me wit an ans .
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