我有一个数据集:
用户功能1功能2功能3功能4。。。在
用户1 f11 f12 f13 f14。。。在
用户2 f21 f22 f23 f24。。。在
我有一个算法应用于这个数据集,这样,对于每个用户,我们可以计算出这个用户和其他用户之间的相似度得分:
score{user_i}=algorithm(dict{user_i},dict{user_k})
dict{user_i}=[f11,f12,f13,f14]是一个散列。在
对于每个用户,在计算出用户与其他所有用户的相似度后,对相似度得分进行降序排序,并给出输出。在
这是减速器.py公司名称:
^{pr2}$以下是hadoop流媒体的bash文件:
hadoop fs -rmr /tmp/somec/some/
hadoop jar *.jar \
-input /user/hive/warehouse/fb_text/ \
-output /tmp/somec/some/ \
-mapper "cat" \
-reducer "jac.py" \
-file jac.py \
fb_文本以制表符分隔。这很好。我测试了一个字计数hadoop流作业。它跑得很顺利。在
下面是hadoop流媒体错误:
rmr: DEPRECATED: Please use 'rm -r' instead.
14/05/14 00:31:55 INFO fs.TrashPolicyDefault: Namenode trash configuration: Deletion interval = 0 minutes, Emptier interval = 0 minutes.
Deleted /tmp/somec/some
14/05/14 00:31:57 WARN streaming.StreamJob: -file option is deprecated, please use generic option -files instead.
packageJobJar: [jac.py] [/opt/cloudera/parcels/CDH-5.0.0-0.cdh5b2.p0.27/lib/hadoop- mapreduce/hadoop-streaming-2.2.0-cdh5.0.0-beta-2.jar] /tmp/streamjob3048667246321733915.jar tmpDir=null
14/05/14 00:31:58 INFO client.RMProxy: Connecting to ResourceManager at ip-10-0-0-190.us-west-2.compute.internal/10.0.0.190:8032
14/05/14 00:31:59 INFO client.RMProxy: Connecting to ResourceManager at ip-10-0-0-190.us-west-2.compute.internal/10.0.0.190:8032
14/05/14 00:32:02 INFO mapred.FileInputFormat: Total input paths to process : 1
14/05/14 00:32:04 INFO mapreduce.JobSubmitter: number of splits:2
14/05/14 00:32:04 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1399599059169_0110
14/05/14 00:32:05 INFO impl.YarnClientImpl: Submitted application application_1399599059169_0110
14/05/14 00:32:05 INFO mapreduce.Job: The url to track the job: http://ip- 10-0-0-190.us-west-2.compute.internal:8088/proxy/application_1399599059169_0110/
14/05/14 00:32:05 INFO mapreduce.Job: Running job: job_1399599059169_0110
14/05/14 00:32:13 INFO mapreduce.Job: Job job_1399599059169_0110 running in uber mode : false
14/05/14 00:32:13 INFO mapreduce.Job: map 0% reduce 0%
14/05/14 00:32:19 INFO mapreduce.Job: map 50% reduce 0%
14/05/14 00:32:20 INFO mapreduce.Job: map 100% reduce 0%
14/05/14 00:32:26 INFO mapreduce.Job: Task Id : attempt_1399599059169_0110_r_000001_0, Status : FAILED
Error: java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code 127
at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:320)
at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:533)
at org.apache.hadoop.streaming.PipeReducer.close(PipeReducer.java:134)
at org.apache.hadoop.io.IOUtils.cleanup(IOUtils.java:237)
at org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:459)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:392)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:165)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:160)
14/05/14 00:32:26 INFO mapreduce.Job: Task Id : attempt_1399599059169_0110_r_000003_0, Status : FAILED
Error: java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code 127
at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:320)
at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:533)
at org.apache.hadoop.streaming.PipeReducer.close(PipeReducer.java:134)
at org.apache.hadoop.io.IOUtils.cleanup(IOUtils.java:237)
at org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:459)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:392)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:165)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:160)
我想知道为什么。在
我的hadoop流媒体jar很好。我测试了一个单词计数的例子,它运行得很顺利。在
这个python代码在本地linux机器上运行得很好。在
你在屏幕上只能看到一半的错误。它基本上是说“python脚本失败了”。在
您需要转到JobTracker UI,找到作业,单击失败的映射任务并查看日志。希望Python给stderr写了一些东西来帮助您。在
对于额外的调试,考虑在脚本中添加一些有用的“println”消息。在
本地测试的一个很好的提示不是只运行Python脚本,而是以与流式处理类似的方式运行它。尝试:
cat数据|地图.py|排序|减少.py在
最后: mapper和reducer的输出都应该是\t(即键和值用制表符分隔)。在
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