r - 使用hadoop流运行R脚本作业失败:PipeMapRed.waitOutputThreads():子进程失败，代码为1

Question

我有一个R脚本，可以在R Colsole中很好地工作，但是当我在Hadoop流中运行时，它在Map阶段失败并出现以下错误。

我有Hadoop Streaming命令:

/home/Bibhu/hadoop-0.20.2/bin/hadoop jar \
   /home/Bibhu/hadoop-0.20.2/contrib/streaming/*.jar \
   -input hdfs://localhost:54310/user/Bibhu/BookTE1.csv \
   -output outsid -mapper `pwd`/code1.sh

标准日志

Loading required package: class
Error in read.table(file = file, header = header, sep = sep, quote = quote,  : 
  no lines available in input
Calls: read.csv -> read.table
Execution halted
java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code 1
    at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:362)
    at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:572)
    at org.apache.hadoop.streaming.PipeMapper.close(PipeMapper.java:136)
    at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:57)
    at org.apache.hadoop.streaming.PipeMapRunner.run(PipeMapRunner.java:36)
    at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358)
    at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
    at org.apache.hadoop.mapred.Child.main(Child.java:170)

系统日志

2013-07-03 19:32:36,080 INFO org.apache.hadoop.metrics.jvm.JvmMetrics: Initializing JVM Metrics with processName=MAP, sessionId=
2013-07-03 19:32:36,654 INFO org.apache.hadoop.mapred.MapTask: numReduceTasks: 1
2013-07-03 19:32:36,675 INFO org.apache.hadoop.mapred.MapTask: io.sort.mb = 100
2013-07-03 19:32:36,835 INFO org.apache.hadoop.mapred.MapTask: data buffer = 79691776/99614720
2013-07-03 19:32:36,835 INFO org.apache.hadoop.mapred.MapTask: record buffer = 262144/327680
2013-07-03 19:32:36,899 INFO org.apache.hadoop.streaming.PipeMapRed: PipeMapRed exec [/home/Bibhu/Downloads/SentimentAnalysis/Sid/smallFile/code1.sh]
2013-07-03 19:32:37,256 INFO org.apache.hadoop.streaming.PipeMapRed: Records R/W=0/1
2013-07-03 19:32:38,509 INFO org.apache.hadoop.streaming.PipeMapRed: MRErrorThread done
2013-07-03 19:32:38,509 INFO org.apache.hadoop.streaming.PipeMapRed: PipeMapRed failed!
2013-07-03 19:32:38,557 WARN org.apache.hadoop.mapred.TaskTracker: Error running child
java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code 1
    at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:362)
    at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:572)
    at org.apache.hadoop.streaming.PipeMapper.close(PipeMapper.java:136)
    at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:57)
    at org.apache.hadoop.streaming.PipeMapRunner.run(PipeMapRunner.java:36)
    at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358)
    at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
    at org.apache.hadoop.mapred.Child.main(Child.java:170)
2013-07-03 19:32:38,631 INFO org.apache.hadoop.mapred.TaskRunner: Runnning cleanup for the task

Answer 1

写hadoopStreaming jar与hadoop-streaming-1.0.4.jar一样的完整版本

使用-file选项

为mapper和reducer指定单独的文件路径

通过-mapper和-reducer选项

告诉hadoop这是您的映射器和化简器代码

有关更多引用，请参见 Running WordCount on Hadoop using R script