[MAPREDUCE-317] Submitting job information via DFS in Map/Reduce causing consistency and performance issues

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Incomplete
• Assignee: Unassigned
• Reporter: Hemanth Yamijala
• Created: 27/Feb/09 13:59
• Updated: 21/Jul/14 21:14
• Resolved: 21/Jul/14 21:14

Description

Job submission involves two steps: submitting jobs to the System directory on DFS (done by the client), then submit the job via the JobSubmissionProtocol to JobTracker. This two step process is seen to have some issues:

• Since the files need to be read from DFS, slowness in the DFS can cause job initialization to become costly. We faced this as described in HADOOP-5286 and HADOOP-4664.
• The two step process could lead to inconsistent information being left around - like in HADOOP-5327 and HADOOP-5335.

This JIRA is to explore options to remove the two step process in submitting a job.