[MAPREDUCE-4000] Create jobTokenPassword file fail when run hadoop pipes locally

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 1.0.1, 1.0.2, 0.23.3
• Component/s: pipes

Environment

Fedora release 16
Linux localhost.localdomain 3.2.7-1.fc16.x86_64 #1 SMP Tue Feb 21 01:40:47 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
Apache Maven 3.0.4 (r1232337; 2012-01-17 16:44:56+0800)
Maven home: /usr/local/apache-maven-3.0.4
Java version: 1.7.0_03, vendor: Oracle Corporation
Java home: /usr/java/jdk1.7.0_03/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.2.7-1.fc16.x86_64", arch: "amd64", family: "unix"

• Assignee: Unassigned
• Reporter: Changming Sun
• Created: 13/Mar/12 07:15
• Updated: 01/Jan/13 23:22

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.