[MAPREDUCE-6664] Default value and the explanation in javadoc is misleading for JobConf#getNumMapTasks

• Type: Bug
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Assignee: J.Andreina
• Reporter: J.Andreina
• Created: 29/Mar/16 04:19
• Updated: 29/Mar/16 08:38

Description

1.

As per mapred-default.xml , default value for number of map task per job is 2, but in JobConf#getNumMapTasks() it is 1

  <name>mapreduce.job.maps</name>
  <value>2</value>

2. Javadoc for getNumMapTasks() is misleading, as it explains about number of reduce task

  /**
   * Get configured the number of reduce tasks for this job.
   * Defaults to <code>1</code>.
   * 
   * @return the number of reduce tasks for this job.
   */
  public int getNumMapTasks() { return getInt(JobContext.NUM_MAPS, 1); }