我想在Hadoop单节点集群上运行排序示例。首先,我开始守护程序:Hadoop在单节点集群上运行排序示例
[email protected]:/home/user/hadoop$ bin/start-all.sh
然后我跑了随机作家例如生成顺序文件作为输入文件。
[email protected]:/home/user/hadoop$ bin/hadoop jar hadoop-*-examples.jar randomwriter rand
Hadoop的@ Ubuntu的:/ home/user中/ Hadoop的$斌/ Hadoop的罐子的hadoop - * - examples.jar randomwriter兰特
运行0地图。
Job started: Thu Mar 31 18:21:51 EEST 2011
11/03/31 18:21:52 INFO mapred.JobClient: Running job: job_201103311816_0001
11/03/31 18:21:53 INFO mapred.JobClient: map 0% reduce 0%
11/03/31 18:22:01 INFO mapred.JobClient: Job complete: job_201103311816_0001
11/03/31 18:22:01 INFO mapred.JobClient: Counters: 0
Job ended: Thu Mar 31 18:22:01 EEST 2011
这项工作耗时9秒。
[email protected]:/home/user/hadoop$ bin/hadoop jar hadoop-*-examples.jar sort rand rand-sort
1个节点运行排序从hdfs://localhost:54310/user/hadoop/rand
成
hdfs://localhost:54310/user/hadoop/rand-sort
1降低。
Job started: Thu Mar 31 18:25:19 EEST 2011
11/03/31 18:25:20 INFO mapred.FileInputFormat: Total input paths to process : 0
11/03/31 18:25:20 INFO mapred.JobClient: Running job: job_201103311816_0002
11/03/31 18:25:21 INFO mapred.JobClient: map 0% reduce 0%
11/03/31 18:25:32 INFO mapred.JobClient: map 0% reduce 100%
11/03/31 18:25:34 INFO mapred.JobClient: Job complete: job_201103311816_0002
11/03/31 18:25:34 INFO mapred.JobClient: Counters: 9
11/03/31 18:25:34 INFO mapred.JobClient: Job Counters
11/03/31 18:25:34 INFO mapred.JobClient: Launched reduce tasks=1
11/03/31 18:25:34 INFO mapred.JobClient: FileSystemCounters
11/03/31 18:25:34 INFO mapred.JobClient: HDFS_BYTES_WRITTEN=96
11/03/31 18:25:34 INFO mapred.JobClient: Map-Reduce Framework
11/03/31 18:25:34 INFO mapred.JobClient: Reduce input groups=0
11/03/31 18:25:34 INFO mapred.JobClient: Combine output records=0
11/03/31 18:25:34 INFO mapred.JobClient: Reduce shuffle bytes=0
11/03/31 18:25:34 INFO mapred.JobClient: Reduce output records=0
11/03/31 18:25:34 INFO mapred.JobClient: Spilled Records=0
11/03/31 18:25:34 INFO mapred.JobClient: Combine input records=0
11/03/31 18:25:34 INFO mapred.JobClient: Reduce input records=0
Job ended: Thu Mar 31 18:25:34 EEST 2011
工作耗时14秒。
[email protected]:/home/user/hadoop$ bin/hadoop dfs -cat rand-sort/part-00000
SEQ# “org.apache.hadoop.io.BytesWritable” org.apache.hadoop.io.BytesWritablej“我& 9#
我是新来的Hadoop。我所做的一切都是正确的,还是我做错了什么?我的问题是,我怎么看到randomwritewr生成的数据和排序示例中的结果是正确的?我从哪里可以看到它们?
看起来好像我有点卡住了......请给我一些正确的命令,以便问题得到解决吗? – 2011-04-05 16:54:03
btw非常感谢你! – 2011-04-05 16:54:25
对不起,这里有个很好的解释: – 2011-04-09 08:51:41