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courses:mapreduce-tutorial:step-31 [2012/02/06 09:22]
straka
courses:mapreduce-tutorial:step-31 [2012/02/06 14:52] (current)
dusek
Line 35: Line 35:
  
 ===== Example ===== ===== Example =====
-This example reads the keys of ''/net/projects/hadoop/examples/inputs/numbers-small'', computes the sum of all the keys and print it:+This example reads the keys of ''/net/projects/hadoop/examples/inputs/numbers-small'', computes the sum of all the keys and prints it:
 <code java Sum.java> <code java Sum.java>
 +import java.io.IOException;
 +
 +import org.apache.hadoop.conf.*;
 +import org.apache.hadoop.fs.Path;
 +import org.apache.hadoop.io.*;
 import org.apache.hadoop.mapreduce.*; import org.apache.hadoop.mapreduce.*;
 import org.apache.hadoop.mapreduce.lib.allreduce.*; import org.apache.hadoop.mapreduce.lib.allreduce.*;
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 You can run the example locally using: You can run the example locally using:
   wget --no-check-certificate 'https://wiki.ufal.ms.mff.cuni.cz/_export/code/courses:mapreduce-tutorial:step-31?codeblock=0' -O Sum.java   wget --no-check-certificate 'https://wiki.ufal.ms.mff.cuni.cz/_export/code/courses:mapreduce-tutorial:step-31?codeblock=0' -O Sum.java
-  make -f /net/projects/hadoop/java/Makefile Sum.java+  make -f /net/projects/hadoop/java/Makefile Sum.jar
   rm -rf step-31-out; /net/projects/hadoop/bin/hadoop Sum.jar /net/projects/hadoop/examples/inputs/numbers-small step-31-out   rm -rf step-31-out; /net/projects/hadoop/bin/hadoop Sum.jar /net/projects/hadoop/examples/inputs/numbers-small step-31-out
   less step-31-out/part-*   less step-31-out/part-*
    
-To run on a cluster with //C// machines using //C// mappers+To run on a cluster using specified number of machines: 
-  rm -rf step-31-out; /net/projects/hadoop/bin/hadoop Sum.jar -c C `/net/projects/hadoop/bin/compute-splitsize /net/projects/hadoop/examples/inputs/numbers-small C` /net/projects/hadoop/examples/inputs/numbers-small step-31-out+  rm -rf step-31-out; M=#of_machines; INPUT=/net/projects/hadoop/examples/inputs/numbers-small; /net/projects/hadoop/bin/hadoop Sum.jar -c $M `/net/projects/hadoop/bin/compute-splitsize $INPUT $M` $INPUT step-31-out
   less step-31-out/part-*   less step-31-out/part-*
  
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   # NOW VIEW THE FILE   # NOW VIEW THE FILE
   # $EDITOR Statistics.java   # $EDITOR Statistics.java
-  make -f /net/projects/hadoop/java/Makefile Statistics.java +  make -f /net/projects/hadoop/java/Makefile Statistics.jar 
-  rm -rf step-31-out; /net/projects/hadoop/bin/hadoop Statistics.jar -c C `/net/projects/hadoop/bin/compute-splitsize /net/projects/hadoop/examples/inputs/numbers-small C` /net/projects/hadoop/examples/inputs/numbers-small step-31-out+  rm -rf step-31-out; M=#of_machines; INPUT=/net/projects/hadoop/examples/inputs/numbers-small; /net/projects/hadoop/bin/hadoop Statistics.jar -c $M `/net/projects/hadoop/bin/compute-splitsize $INPUT $M` $INPUT step-31-out
   less step-31-out/part-*   less step-31-out/part-*
  
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   # NOW VIEW THE FILE   # NOW VIEW THE FILE
   # $EDITOR Median.java   # $EDITOR Median.java
-  make -f /net/projects/hadoop/java/Makefile Median.java +  make -f /net/projects/hadoop/java/Makefile Median.jar 
-  rm -rf step-31-out; /net/projects/hadoop/bin/hadoop Median.jar -c C `/net/projects/hadoop/bin/compute-splitsize /net/projects/hadoop/examples/inputs/numbers-small C` /net/projects/hadoop/examples/inputs/numbers-small step-31-out+  rm -rf step-31-out; M=#of_machines; INPUT=/net/projects/hadoop/examples/inputs/numbers-small; /net/projects/hadoop/bin/hadoop Median.jar -c $M `/net/projects/hadoop/bin/compute-splitsize $INPUT $M` $INPUT step-31-out
   less step-31-out/part-*   less step-31-out/part-*
  
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   # NOW VIEW THE FILE   # NOW VIEW THE FILE
   # $EDITOR KMeans.java   # $EDITOR KMeans.java
-  make -f /net/projects/hadoop/java/Makefile KMeans.java+  make -f /net/projects/hadoop/java/Makefile KMeans.jar
 You can run it using specified number of machines on the following input data: You can run it using specified number of machines on the following input data:
   * ''/net/projects/hadoop/examples/inputs/points-small'':   * ''/net/projects/hadoop/examples/inputs/points-small'':
-<code>M=machines; K=50; INPUT=/net/projects/hadoop/examples/inputs/points-small/points.txt +<code>M=#of_machines; K=50; INPUT=/net/projects/hadoop/examples/inputs/points-small/points.txt 
-rm -rf step-31-out; /net/projects/hadoop/bin/hadoop KMeans.jar -Dclusters.num=$K -Dclusters.file=$INPUT [-jt jobtracker | -c $M`/net/projects/hadoop/bin/compute-splitsize $INPUT $M` $INPUT step-31-out</code>+rm -rf step-31-out; /net/projects/hadoop/bin/hadoop KMeans.jar -Dclusters.num=$K -Dclusters.file=$INPUT -c $M `/net/projects/hadoop/bin/compute-splitsize $INPUT $M` $INPUT step-31-out</code>
   * ''/net/projects/hadoop/examples/inputs/points-medium'':   * ''/net/projects/hadoop/examples/inputs/points-medium'':
-<code>M=machines; K=100; INPUT=/net/projects/hadoop/examples/inputs/points-medium/points.txt +<code>M=#of_machines; K=100; INPUT=/net/projects/hadoop/examples/inputs/points-medium/points.txt 
-rm -rf step-31-out; /net/projects/hadoop/bin/hadoop KMeans.jar -Dclusters.num=$K -Dclusters.file=$INPUT [-jt jobtracker | -c $M`/net/projects/hadoop/bin/compute-splitsize $INPUT $M` $INPUT step-31-out</code>+rm -rf step-31-out; /net/projects/hadoop/bin/hadoop KMeans.jar -Dclusters.num=$K -Dclusters.file=$INPUT -c $M `/net/projects/hadoop/bin/compute-splitsize $INPUT $M` $INPUT step-31-out</code>
   * ''/net/projects/hadoop/examples/inputs/points-large'':   * ''/net/projects/hadoop/examples/inputs/points-large'':
-<code>M=machines; K=200; INPUT=/net/projects/hadoop/examples/inputs/points-large/points.txt +<code>M=#of_machines; K=200; INPUT=/net/projects/hadoop/examples/inputs/points-large/points.txt 
-rm -rf step-31-out; /net/projects/hadoop/bin/hadoop KMeans.jar -Dclusters.num=$K -Dclusters.file=$INPUT [-jt jobtracker | -c $M`/net/projects/hadoop/bin/compute-splitsize $INPUT $M` $INPUT step-31-out</code>+rm -rf step-31-out; /net/projects/hadoop/bin/hadoop KMeans.jar -Dclusters.num=$K -Dclusters.file=$INPUT -c $M `/net/projects/hadoop/bin/compute-splitsize $INPUT $M` $INPUT step-31-out</code>
  
 Solution: {{:courses:mapreduce-tutorial:step-31-solution3.txt|KMeans.java}}. Solution: {{:courses:mapreduce-tutorial:step-31-solution3.txt|KMeans.java}}.
  

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