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  1. Hadoop Map/Reduce
  2. MAPREDUCE-3112

Calling hadoop cli inside mapreduce job leads to errors

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Details

    • Bug
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 0.20.205.0, 0.23.0
    • 0.20.205.0, 0.23.0
    • contrib/streaming
    • None
    • Java, Linux

    • Hide
      Removed inheritance of certain server environment variables (HADOOP_OPTS and HADOOP_ROOT_LOGGER) in task attempt process.
      Show
      Removed inheritance of certain server environment variables (HADOOP_OPTS and HADOOP_ROOT_LOGGER) in task attempt process.

    Description

      When running a streaming job with mapper

      bin/hadoop --config /etc/hadoop/ jar contrib/streaming/hadoop-streaming-0.20.205.0.jar -mapper "hadoop --config /etc/hadoop/ dfs -help" -reducer NONE -input "/tmp/input.txt" -output NONE

      Task log shows:

      Exception in thread "main" java.lang.ExceptionInInitializerError
      	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:57)
      	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
      	at org.apache.hadoop.fs.FsShell.main(FsShell.java:1895)
      Caused by: org.apache.commons.logging.LogConfigurationException: User-specified log class 'org.apache.commons.logging.impl.Log4JLogger' cannot be found or is not useable.
      	at org.apache.commons.logging.impl.LogFactoryImpl.discoverLogImplementation(LogFactoryImpl.java:874)
      	at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:604)
      	at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:336)
      	at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:310)
      	at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:685)
      	at org.apache.hadoop.conf.Configuration.<clinit>(Configuration.java:142)
      	... 3 more
      java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code 1
      	at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:311)
      	at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:545)
      	at org.apache.hadoop.streaming.PipeMapper.close(PipeMapper.java:132)
      	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:436)
      	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:372)
      	at org.apache.hadoop.mapred.Child$4.run(Child.java:261)
      	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:1059)
      	at org.apache.hadoop.mapred.Child.main(Child.java:255)
      

      Upon inspection, there are two problems in the inherited from environment which prevent the logger initialization to work properly. In hadoop-env.sh, the HADOOP_OPTS is inherited from the parent process. This configuration was requested by user to have a way to override HADOOP environment in the configuration template:

      export HADOOP_OPTS="-Djava.net.preferIPv4Stack=true $HADOOP_OPTS"
      

      -Dhadoop.log.dir=$HADOOP_LOG_DIR/task_tracker_user is injected into HADOOP_OPTS in the tasktracker environment. Hence, the running task would inherit the wrong logging directory, which the end user might not have sufficient access to write. Second, $HADOOP_ROOT_LOGGER is override to: -Dhadoop.root.logger=INFO,TLA by the task controller, therefore, the bin/hadoop script will attempt to use hadoop.root.logger=INFO,TLA, but fail to initialize.

      Attachments

        1. HAPREDUCE-3112-1.patch
          0.7 kB
          Eric Yang
        2. MAPREDUCE-3112.patch
          1 kB
          Eric Yang
        3. MAPREDUCE-3112-trunk.patch
          2 kB
          Eric Yang
        4. MAPREDUCE-3112-trunk-2.patch
          2 kB
          Eric Yang

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            eyang Eric Yang
            eyang Eric Yang
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              Updated:
              Resolved:

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