Class DistributedPentomino

  extended by org.apache.hadoop.conf.Configured
      extended by org.apache.hadoop.examples.dancing.DistributedPentomino
All Implemented Interfaces:
Configurable, Tool

public class DistributedPentomino
extends Configured
implements Tool

Launch a distributed pentomino solver. It generates a complete list of prefixes of length N with each unique prefix as a separate line. A prefix is a sequence of N integers that denote the index of the row that is choosen for each column in order. Note that the next column is heuristically choosen by the solver, so it is dependant on the previous choice. That file is given as the input to map/reduce. The output key/value are the move prefix/solution as Text/Text.

Nested Class Summary
static class DistributedPentomino.PentMap
          Each map takes a line, which represents a prefix move and finds all of the solutions that start with that prefix.
Constructor Summary
Method Summary
static void main(String[] args)
          Launch the solver on 9x10 board and the one sided pentominos.
 int run(String[] args)
          Execute the command with the given arguments.
Methods inherited from class org.apache.hadoop.conf.Configured
getConf, setConf
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods inherited from interface org.apache.hadoop.conf.Configurable
getConf, setConf

Constructor Detail


public DistributedPentomino()
Method Detail


public static void main(String[] args)
                 throws Exception
Launch the solver on 9x10 board and the one sided pentominos. This takes about 2.5 hours on 20 nodes with 2 cpus/node. Splits the job into 2000 maps and 1 reduce.



public int run(String[] args)
        throws Exception
Description copied from interface: Tool
Execute the command with the given arguments.

Specified by:
run in interface Tool
args - command specific arguments.
exit code.

Copyright © 2009 The Apache Software Foundation