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我正在运行RHadoop的示例脚本来测试系统并使用以下命令。R的Hadoop流式传输失败
library(rmr2)
library(rhdfs)
Sys.setenv(HADOOP_HOME="/usr/bin/hadoop")
Sys.setenv(HADOOP_CMD="/usr/bin/hadoop")
Sys.setenv(HADOOP_STREAMING="/opt/cloudera/parcels/CDH-4.3.0-1.cdh4.3.0.p0.22/lib/hadoop-mapreduce/hadoop-streaming.jar")
hdfs.init()
ints = to.dfs(1:100)
calc = mapreduce(input = ints, map = function(k, v) cbind(v, 2*v))
但它给了我一个像下面的错误。
>Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class org.apache.hadoop.streaming.AutoInputFormat not found
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1587)
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1611)
13/08/21 18:30:25 INFO mapred.JobClient: Job complete: job_201308191923_0307
13/08/21 18:30:25 INFO mapred.JobClient: Counters: 7
13/08/21 18:30:25 INFO mapred.JobClient: Job Counters
13/08/21 18:30:25 INFO mapred.JobClient: Failed map tasks=1
13/08/21 18:30:25 INFO mapred.JobClient: Launched map tasks=8
13/08/21 18:30:25 INFO mapred.JobClient: Data-local map tasks=8
13/08/21 18:30:25 INFO mapred.JobClient: Total time spent by all maps in occupied slots (ms)=46647
13/08/21 18:30:25 INFO mapred.JobClient: Total time spent by all reduces in occupied slots (ms)=0
13/08/21 18:30:25 INFO mapred.JobClient: Total time spent by all maps waiting after reserving slots (ms)=0
13/08/21 18:30:25 INFO mapred.JobClient: Total time spent by all reduces waiting after reserving slots (ms)=0
13/08/21 18:30:25 ERROR streaming.StreamJob: Job not Successful!
Streaming Command Failed!
Error in mr(map = map, reduce = reduce, combine = combine, in.folder = if (is.list(input)) { :
hadoop streaming failed with error code 1
什么可能是错在这里
感谢您对HADOOP_CMD和HADOOP_HOME的评论。我已经浏览了一些页面,但“stderr”离我还有很远的距离。如有可能,任何婴儿步骤。 – LonelySoul
对我来说,最简单的方法就是使用Web UI。我使用控制台,你会看到一个跟踪网址,在那里浏览。无法解释确切的点击次序,但查找失败的任务,单击特定的一项,然后查找屏幕最右侧日志的链接。这是一般的Hadoop,所以你可以在Hadoop的介绍材料中找到一个独立于RHadoop的Web UI。 – piccolbo
非常感谢那个方向。我发现stderr和stdout都是--empty--。这是否意味着我需要更改* .jar文件。因为我从一个人那里得到了这个链接。 – LonelySoul