Hi, I have run Michael's python map reduce example several times without any issue.
I think this issue is related to your file path 'mapper.py'. you are using python binary? try this, hadoop jar /home/yyy/Dropbox/Private/xxx/Projects/task_week_22/hadoop-streaming-1.1.2.jar \ -input /user/yyy/20417-8.txt \ -output /user/yyy/output \ -file /home/yyy/Dropbox/Private/xxx/Projects/task_week_22/mapper.py \ -mapper /home/yyy/Dropbox/Private/xxx/Projects/task_week_22/mapper.py \ -file /home/yyy/Dropbox/Private/xxx/Projects/task_week_22/reducer.py \ -reducer /home/yyy/Dropbox/Private/xxx/Projects/task_week_22/reducer.py Thanks~ On Fri, May 24, 2013 at 10:12 PM, Adamantios Corais < adamantios.cor...@gmail.com> wrote: > I tried this nice example: > http://www.michael-noll.com/tutorials/writing-an-hadoop-mapreduce-program-in-python/ > > The python scripts work pretty fine from my laptop (through terminal), but > they don't when I execute them on the CDH3 (Pseudo-Distributed Mode). > > Any ideas? > > hadoop jar > /home/yyy/Dropbox/Private/xxx/Projects/task_week_22/hadoop-streaming-1.1.2.jar > \ > -input /user/yyy/20417-8.txt \ > -output /user/yyy/output \ > -file /usr/bin/python > /home/yyy/Dropbox/Private/xxx/Projects/task_week_22/mapper.py \ > -mapper /usr/bin/python > /home/yyy/Dropbox/Private/xxx/Projects/task_week_22/mapper.py \ > -file /home/yyy/Dropbox/Private/xxx/Projects/task_week_22/reducer.py \ > -reducer /home/yyy/Dropbox/Private/xxx/Projects/task_week_22/reducer.py > > ----------------------- > > 2013-05-24 18:21:12,232 INFO org.apache.hadoop.util.NativeCodeLoader: > Loaded the native-hadoop library > 2013-05-24 18:21:12,569 INFO > org.apache.hadoop.filecache.TrackerDistributedCacheManager: Creating > symlink: > /var/lib/hadoop-0.20/cache/mapred/mapred/local/taskTracker/yyy/jobcache/job_201305160832_0020/jars/job.jar > <- > /var/lib/hadoop-0.20/cache/mapred/mapred/local/taskTracker/yyy/jobcache/job_201305160832_0020/attempt_201305160832_0020_m_000000_0/work/job.jar > 2013-05-24 18:21:12,586 INFO > org.apache.hadoop.filecache.TrackerDistributedCacheManager: Creating > symlink: > /var/lib/hadoop-0.20/cache/mapred/mapred/local/taskTracker/yyy/jobcache/job_201305160832_0020/jars/.job.jar.crc > <- > /var/lib/hadoop-0.20/cache/mapred/mapred/local/taskTracker/yyy/jobcache/job_201305160832_0020/attempt_201305160832_0020_m_000000_0/work/.job.jar.crc > 2013-05-24 18:21:12,717 INFO org.apache.hadoop.metrics.jvm.JvmMetrics: > Initializing JVM Metrics with processName=MAP, sessionId= > 2013-05-24 18:21:13,062 INFO org.apache.hadoop.util.ProcessTree: setsid > exited with exit code 0 > 2013-05-24 18:21:13,087 INFO org.apache.hadoop.mapred.Task: Using > ResourceCalculatorPlugin : > org.apache.hadoop.util.LinuxResourceCalculatorPlugin@1358f03 > 2013-05-24 18:21:13,452 WARN > org.apache.hadoop.io.compress.snappy.LoadSnappy: Snappy native library is > available > 2013-05-24 18:21:13,452 INFO > org.apache.hadoop.io.compress.snappy.LoadSnappy: Snappy native library > loaded > 2013-05-24 18:21:13,464 INFO org.apache.hadoop.mapred.MapTask: > numReduceTasks: 1 > 2013-05-24 18:21:13,477 INFO org.apache.hadoop.mapred.MapTask: io.sort.mb > = 100 > 2013-05-24 18:21:13,635 INFO org.apache.hadoop.mapred.MapTask: data buffer > = 79691776/99614720 > 2013-05-24 18:21:13,635 INFO org.apache.hadoop.mapred.MapTask: record > buffer = 262144/327680 > 2013-05-24 18:21:13,724 INFO org.mortbay.log: Logging to > org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via > org.mortbay.log.Slf4jLog > 2013-05-24 18:21:13,733 INFO org.apache.hadoop.streaming.PipeMapRed: > PipeMapRed exec [mapper.py] > 2013-05-24 18:21:13,783 ERROR org.apache.hadoop.streaming.PipeMapRed: > configuration exception > java.io.IOException: Cannot run program "mapper.py": java.io.IOException: > error=2, No such file or directory > at java.lang.ProcessBuilder.start(ProcessBuilder.java:460) > at > org.apache.hadoop.streaming.PipeMapRed.configure(PipeMapRed.java:214) > at org.apache.hadoop.streaming.PipeMapper.configure(PipeMapper.java:66) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > at java.lang.reflect.Method.invoke(Method.java:597) > at > org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88) > at > org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64) > at > org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117) > at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > at java.lang.reflect.Method.invoke(Method.java:597) > at > org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88) > at > org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64) > at > org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117) > at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:387) > at org.apache.hadoop.mapred.MapTask.run(MapTask.java:325) > at org.apache.hadoop.mapred.Child$4.run(Child.java:266) > at java.security.AccessController.doPrivileged(Native Method) > at javax.security.auth.Subject.doAs(Subject.java:396) > at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1278) > at org.apache.hadoop.mapred.Child.main(Child.java:260) > Caused by: java.io.IOException: java.io.IOException: error=2, No such file > or directory > at java.lang.UNIXProcess.<init>(UNIXProcess.java:148) > at java.lang.ProcessImpl.start(ProcessImpl.java:65) > at java.lang.ProcessBuilder.start(ProcessBuilder.java:453) > ... 24 more > 2013-05-24 18:21:13,869 INFO org.apache.hadoop.mapred.TaskLogsTruncater: > Initializing logs' truncater with mapRetainSize=-1 and reduceRetainSize=-1 > 2013-05-24 18:21:13,871 WARN org.apache.hadoop.mapred.Child: Error running > child > java.lang.RuntimeException: Error in configuring object > at > org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93) > at > org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64) > at > org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117) > at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:387) > at org.apache.hadoop.mapred.MapTask.run(MapTask.java:325) > at org.apache.hadoop.mapred.Child$4.run(Child.java:266) > at java.security.AccessController.doPrivileged(Native Method) > at javax.security.auth.Subject.doAs(Subject.java:396) > at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1278) > at org.apache.hadoop.mapred.Child.main(Child.java:260) > Caused by: java.lang.reflect.InvocationTargetException > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > at java.lang.reflect.Method.invoke(Method.java:597) > at > org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88) > ... 9 more > Caused by: java.lang.RuntimeException: Error in configuring object > at > org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93) > at > org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64) > at > org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117) > at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34) > ... 14 more > Caused by: java.lang.reflect.InvocationTargetException > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > at java.lang.reflect.Method.invoke(Method.java:597) > at > org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88) > ... 17 more > Caused by: java.lang.RuntimeException: configuration exception > at > org.apache.hadoop.streaming.PipeMapRed.configure(PipeMapRed.java:230) > at org.apache.hadoop.streaming.PipeMapper.configure(PipeMapper.java:66) > ... 22 more > Caused by: java.io.IOException: Cannot run program "mapper.py": > java.io.IOException: error=2, No such file or directory > at java.lang.ProcessBuilder.start(ProcessBuilder.java:460) > at > org.apache.hadoop.streaming.PipeMapRed.configure(PipeMapRed.java:214) > ... 23 more > Caused by: java.io.IOException: java.io.IOException: error=2, No such file > or directory > at java.lang.UNIXProcess.<init>(UNIXProcess.java:148) > at java.lang.ProcessImpl.start(ProcessImpl.java:65) > at java.lang.ProcessBuilder.start(ProcessBuilder.java:453) > ... 24 more > 2013-05-24 18:21:13,879 INFO org.apache.hadoop.mapred.Task: Runnning > cleanup for the task >
