mahout学习

参考：http://www.360doc.com/content/14/0117/09/1200324_345883534.shtml

Precondition: 启动Hadoop集群

bin/hdfs namenode -format

sbin/start-dfs.sh(启动Namenode,nodenode相关节点)

sbin/start-yarn.sh(启动ResourceManager，nodeManager相关资源)

bin/hdfs dfsadmin -safemode leave(关闭安全模式)

Note：所有bin/mahout下对应的输入文件，输入文件夹均在HDFS文件目录下

In addition，Mahout下处理的文件必须是SequenceFile文件格式的，故需将txt格式文件转化为SequenceFile文件，如下：

kelvin@Master:~/UntarFile/mahout-0.7-cdh4.5.0$  bin/mahout seqdirectory -input（输入） /TagOutput/txtFile.txt -output（输出）/TagOutput/seqFile.txt   --charset UTF-8

相关实践过程如下：

(将sequenceFile文件转化为可读的txt文件)

kelvin@Master:~/UntarFile/mahout-0.7-cdh4.5.0$  bin/mahout seqdumper -i（输入） /TagOutput/clusteredPoints/part-m-00000 -o（输出） ./TagOutput/clusterPoints.txt
Running on hadoop, using /home/kelvin/UntarFile/hadoop2CDH4//bin/hadoop and HADOOP_CONF_DIR=
MAHOUT-JOB: /home/kelvin/UntarFile/mahout-0.7-cdh4.5.0/mahout-examples-0.7-cdh4.5.0-job.jar
14/06/06 02:18:07 INFO common.AbstractJob: Command line arguments: {--endPhase=[2147483647], --input=[/TagOutput/clusteredPoints/part-m-00000], --output=[./TagOutput/clusterPoints.txt], --startPhase=[0], --tempDir=[temp]}
14/06/06 02:18:08 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
14/06/06 02:18:08 INFO driver.MahoutDriver: Program took 1162 ms (Minutes: 0.019366666666666667)
kelvin@Master:~/UntarFile/mahout-0.7-cdh4.5.0$ cd TagOutput/
kelvin@Master:~/UntarFile/mahout-0.7-cdh4.5.0/TagOutput$ ll
total 12
drwxrwxr-x  2 kelvin kelvin 4096  6? 6 02:12 ./
drwxr-xr-x 16 kelvin kelvin 4096  6? 6 02:15 ../
-rw-rw-r--  1 kelvin kelvin 2767  6? 6 02:18 clusterPoints.txt
kelvin@Master:~/UntarFile/mahout-0.7-cdh4.5.0/TagOutput$ cat clusterPoints.txt
Input Path: /TagOutput/clusteredPoints/part-m-00000
Key class: class org.apache.hadoop.io.IntWritable Value Class: class org.apache.mahout.clustering.classify.WeightedPropertyVectorWritable
Key: 14: Value: wt: 1.0 distance: 13.357142857142858  vec: 2012000317 = [24.000]
Key: 14: Value: wt: 1.0 distance: 6.642857142857143  vec: 2012000318 = [4.000]
Key: 25: Value: wt: 1.0 distance: 11.615384615384592  vec: 2012000319 = [56.000]
Key: 14: Value: wt: 1.0 distance: 7.642857142857142  vec: 2012000320 = [3.000]
Key: 14: Value: wt: 1.0 distance: 11.357142857142858  vec: 2012000321 = [22.000]
Key: 25: Value: wt: 1.0 distance: 0.6153846153846132  vec: 2012000322 = [45.000]
Key: 14: Value: wt: 1.0 distance: 13.357142857142858  vec: 2012000323 = [24.000]
Key: 14: Value: wt: 1.0 distance: 6.642857142857143  vec: 2012000324 = [4.000]
Key: 25: Value: wt: 1.0 distance: 11.615384615384592  vec: 2012000325 = [56.000]
Key: 14: Value: wt: 1.0 distance: 7.642857142857142  vec: 2012000326 = [3.000]
Key: 14: Value: wt: 1.0 distance: 11.357142857142858  vec: 2012000327 = [22.000]
Key: 25: Value: wt: 1.0 distance: 2.384615384615403  vec: 2012000328 = [42.000]
Key: 25: Value: wt: 1.0 distance: 4.61538461538464  vec: 2012000329 = [49.000]
Key: 25: Value: wt: 1.0 distance: 3.384615384615356  vec: 2012000330 = [41.000]
Key: 14: Value: wt: 1.0 distance: 5.642857142857143  vec: 2012000331 = [5.000]
Key: 14: Value: wt: 1.0 distance: 7.642857142857142  vec: 2012000332 = [3.000]
Key: 14: Value: wt: 1.0 distance: 10.357142857142858  vec: 2012000333 = [21.000]
Key: 25: Value: wt: 1.0 distance: 10.38461538461539  vec: 2012000334 = [34.000]
Key: 25: Value: wt: 1.0 distance: 15.384615384615387  vec: 2012000335 = [29.000]
Key: 25: Value: wt: 1.0 distance: 1.3846153846153868  vec: 2012000336 = [43.000]
Key: 25: Value: wt: 1.0 distance: 9.615384615384606  vec: 2012000337 = [54.000]
Key: 25: Value: wt: 1.0 distance: 8.384615384615397  vec: 2012000338 = [36.000]
Key: 14: Value: wt: 1.0 distance: 8.642857142857142  vec: 2012000339 = [2.000]
Key: 14: Value: wt: 1.0 distance: 5.642857142857143  vec: 2012000340 = [5.000]
Key: 20: Value: wt: 1.0 distance: 1.7999999999999972  vec: 2012000341 = [78.000]
Key: 25: Value: wt: 1.0 distance: 9.615384615384606  vec: 2012000342 = [54.000]
Key: 20: Value: wt: 1.0 distance: 13.800000000000018  vec: 2012000343 = [66.000]
Key: 14: Value: wt: 1.0 distance: 3.6428571428571423  vec: 2012000344 = [7.000]
Key: 20: Value: wt: 1.0 distance: 29.200000000000053  vec: 2012000345 = [109.000]
Key: 20: Value: wt: 1.0 distance: 11.800000000000068  vec: 2012000346 = [68.000]
Key: 20: Value: wt: 1.0 distance: 1.7999999999999972  vec: 2012000347 = [78.000]
Key: 25: Value: wt: 1.0 distance: 6.384615384615375  vec: 2012000348 = [38.000]
Count: 32
（将相应的数据结点聚类后输出）

kelvin@Master:~/UntarFile/mahout-0.7-cdh4.5.0$  bin/mahout clusterdump --input /TagOutput/*final(:目录，非文件，最后一次迭代的clusters) --pointsDir /TagOutput/clusteredPoints（最后一次聚类后的点） --output ./TagOutput/clusterResult.txt
Running on hadoop, using /home/kelvin/UntarFile/hadoop2CDH4//bin/hadoop and HADOOP_CONF_DIR=
MAHOUT-JOB: /home/kelvin/UntarFile/mahout-0.7-cdh4.5.0/mahout-examples-0.7-cdh4.5.0-job.jar
14/06/06 02:50:11 INFO common.AbstractJob: Command line arguments: {--dictionaryType=[text], --distanceMeasure=[org.apache.mahout.common.distance.SquaredEuclideanDistanceMeasure], --endPhase=[2147483647], --input=[/TagOutput/*final], --output=[./TagOutput/clusterResult.txt], --outputFormat=[TEXT], --pointsDir=[/TagOutput/clusteredPoints], --startPhase=[0], --tempDir=[temp]}
14/06/06 02:50:12 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
14/06/06 02:50:14 INFO clustering.ClusterDumper: Wrote 3 clusters
14/06/06 02:50:14 INFO driver.MahoutDriver: Program took 2809 ms (Minutes: 0.046816666666666666)
kelvin@Master:~/UntarFile/mahout-0.7-cdh4.5.0$ cd TagOutput/
kelvin@Master:~/UntarFile/mahout-0.7-cdh4.5.0/TagOutput$ ls
clusterPoints.txt  clusterResult.txt
kelvin@Master:~/UntarFile/mahout-0.7-cdh4.5.0/TagOutput$ ll
total 16
drwxrwxr-x  2 kelvin kelvin 4096  6? 6 02:30 ./
drwxr-xr-x 16 kelvin kelvin 4096  6? 6 02:15 ../
-rw-rw-r--  1 kelvin kelvin 2767  6? 6 02:18 clusterPoints.txt
-rw-rw-r--  1 kelvin kelvin 2108  6? 6 02:50 clusterResult.txt
kelvin@Master:~/UntarFile/mahout-0.7-cdh4.5.0/TagOutput$ cat clusterResult.txt
VL-14{n=14 c=[10.643] r=[9.013]}
        Weight : [props - optional]:  Point:
        1.0 : [distance=13.357142857142858]: 2012000317 = [24.000]
        1.0 : [distance=6.642857142857143]: 2012000318 = [4.000]
        1.0 : [distance=7.642857142857142]: 2012000320 = [3.000]
        1.0 : [distance=11.357142857142858]: 2012000321 = [22.000]
        1.0 : [distance=13.357142857142858]: 2012000323 = [24.000]
        1.0 : [distance=6.642857142857143]: 2012000324 = [4.000]
        1.0 : [distance=7.642857142857142]: 2012000326 = [3.000]
        1.0 : [distance=11.357142857142858]: 2012000327 = [22.000]
        1.0 : [distance=5.642857142857143]: 2012000331 = [5.000]
        1.0 : [distance=7.642857142857142]: 2012000332 = [3.000]
        1.0 : [distance=10.357142857142858]: 2012000333 = [21.000]
        1.0 : [distance=8.642857142857142]: 2012000339 = [2.000]
        1.0 : [distance=5.642857142857143]: 2012000340 = [5.000]
        1.0 : [distance=3.6428571428571423]: 2012000344 = [7.000]
VL-20{n=5 c=[79.800] r=[15.419]}
        Weight : [props - optional]:  Point:
        1.0 : [distance=1.7999999999999972]: 2012000341 = [78.000]
        1.0 : [distance=13.800000000000018]: 2012000343 = [66.000]
        1.0 : [distance=29.200000000000053]: 2012000345 = [109.000]
        1.0 : [distance=11.800000000000068]: 2012000346 = [68.000]
        1.0 : [distance=1.7999999999999972]: 2012000347 = [78.000]
VL-25{n=13 c=[44.385] r=[8.553]}
        Weight : [props - optional]:  Point:
        1.0 : [distance=11.615384615384592]: 2012000319 = [56.000]
        1.0 : [distance=0.6153846153846132]: 2012000322 = [45.000]
        1.0 : [distance=11.615384615384592]: 2012000325 = [56.000]
        1.0 : [distance=2.384615384615403]: 2012000328 = [42.000]
        1.0 : [distance=4.61538461538464]: 2012000329 = [49.000]
        1.0 : [distance=3.384615384615356]: 2012000330 = [41.000]
        1.0 : [distance=10.38461538461539]: 2012000334 = [34.000]
        1.0 : [distance=15.384615384615387]: 2012000335 = [29.000]
        1.0 : [distance=1.3846153846153868]: 2012000336 = [43.000]
        1.0 : [distance=9.615384615384606]: 2012000337 = [54.000]
        1.0 : [distance=8.384615384615397]: 2012000338 = [36.000]
        1.0 : [distance=9.615384615384606]: 2012000342 = [54.000]
        1.0 : [distance=6.384615384615375]: 2012000348 = [38.000]
上述结果的输出等同于在Eclipse中编写的ClusterDumper，如下：

public static void run(Configuration conf, Path input, Path output, DistanceMeasure measure, double t1, double t2,
      double convergenceDelta, int maxIterations) throws Exception {
    Path directoryContainingConvertedInput = new Path(output, DIRECTORY_CONTAINING_CONVERTED_INPUT);
    log.info("Preparing Input");
    TagInputDriver.runJob(input, directoryContainingConvertedInput, "org.apache.mahout.math.RandomAccessSparseVector");
    log.info("Running Canopy to get initial clusters");
    Path canopyOutput = new Path(output, "canopies");
    CanopyDriver.run(new Configuration(), directoryContainingConvertedInput, canopyOutput, measure, t1, t2, false, 0.0,
        false);
    log.info("Running KMeans");
    TagKMeansDriver.run(conf, directoryContainingConvertedInput, new Path(canopyOutput, Cluster.INITIAL_CLUSTERS_DIR
        + "-final"), output, convergenceDelta, maxIterations, true, 0.0, false);
    // run ClusterDumper
    ClusterDumper clusterDumper = new ClusterDumper(new Path(output, "clusters-*-final"), new Path(output,
        "clusteredPoints"));
    clusterDumper.printClusters(null);
  }

其他前提操作：

kelvin@Master:~/UntarFile/hadoop2CDH4$ bin/hadoop fs -put ./../mahout-0.7-cdh4.5.0/output/* /TagOutput
14/06/06 01:53:16 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
kelvin@Master:~/UntarFile/hadoop2CDH4$ bin/hadoop fs -ls /TagOutput
14/06/06 01:53:33 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Found 15 items
-rw-r--r--   1 kelvin supergroup        194 2014-06-06 01:53 /TagOutput/_policy
drwxr-xr-x   - kelvin supergroup          0 2014-06-06 01:53 /TagOutput/clusteredPoints
drwxr-xr-x   - kelvin supergroup          0 2014-06-06 01:53 /TagOutput/clusters-0
drwxr-xr-x   - kelvin supergroup          0 2014-06-06 01:53 /TagOutput/clusters-1
drwxr-xr-x   - kelvin supergroup          0 2014-06-06 01:53 /TagOutput/clusters-10-final
drwxr-xr-x   - kelvin supergroup          0 2014-06-06 01:53 /TagOutput/clusters-2
drwxr-xr-x   - kelvin supergroup          0 2014-06-06 01:53 /TagOutput/clusters-3
drwxr-xr-x   - kelvin supergroup          0 2014-06-06 01:53 /TagOutput/clusters-4
drwxr-xr-x   - kelvin supergroup          0 2014-06-06 01:53 /TagOutput/clusters-5
drwxr-xr-x   - kelvin supergroup          0 2014-06-06 01:53 /TagOutput/clusters-6
drwxr-xr-x   - kelvin supergroup          0 2014-06-06 01:53 /TagOutput/clusters-7
drwxr-xr-x   - kelvin supergroup          0 2014-06-06 01:53 /TagOutput/clusters-8
drwxr-xr-x   - kelvin supergroup          0 2014-06-06 01:53 /TagOutput/clusters-9
drwxr-xr-x   - kelvin supergroup          0 2014-06-06 01:53 /TagOutput/data
drwxr-xr-x   - kelvin supergroup          0 2014-06-06 01:53 /TagOutput/random-seeds

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原文地址：https://www.cnblogs.com/likai198981/p/3773167.html