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  1. Hadoop Map/Reduce
  2. MAPREDUCE-4000

Create jobTokenPassword file fail when run hadoop pipes locally

    Details

    • Type: Bug
    • Status: Open
    • Priority: Minor
    • Resolution: Unresolved
    • Affects Version/s: 1.0.1, 1.0.2, 0.23.3
    • Fix Version/s: None
    • Component/s: pipes
    • Labels:
      None
    • Environment:

      Description

      Create jobTokenPassword file fail when run hadoop pipes locally.

      I have put such settings in my job conf.

       
      <property>
        <name>mapreduce.jobtracker.address</name>
        <value>local</value>
      </property>
      
      <property>
        <name>mapreduce.framework.name</name>
        <value>local</value>
      </property>
      
      <property>
        <name>fs.defaultFS</name>
        <value>file:///</value>
      </property>
      

      This job has one map task ,and one reduce task. It will fail when running PipesReducer, because "jobTokenPassword" file is created at current working directory,with permission 0400.

      org.apache.hadoop.mapred.pipes.Application.java
       
       private void writePasswordToLocalFile(String localPasswordFile,
            byte[] password, JobConf conf) throws IOException {
          FileSystem localFs = FileSystem.getLocal(conf);
          Path localPath = new Path(localPasswordFile);
          FSDataOutputStream out = FileSystem.create(localFs, localPath,
              new FsPermission("400"));
          out.write(password);
          out.close();
        }
      

      So, it will fail at the second time.

      In such situation,the application cannot be initialized, but the PipesReducer.close() method will be called after that ,so there will be NullPointer Exception raise in close() method.

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            • Assignee:
              Unassigned
              Reporter:
              snnn Changming Sun
            • Votes:
              1 Vote for this issue
              Watchers:
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                Updated:

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