[MAPREDUCE-5568] JHS returns invalid string for reducer completion percentage if AM restarts with 0 reducer.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.1, 2.5.1
• Fix Version/s: 2.7.0
• Target Version/s: 2.7.0
• Hadoop Flags: Reviewed
• Assignee: MinJi Kim
• Reporter: Jian He
• Created: 05/Oct/13 23:34
• Updated: 10/Apr/15 20:19
• Resolved: 25/Nov/14 21:04

Description

JobCLient shows like:

13/10/05 16:26:09 INFO mapreduce.Job:  map 100% reduce NaN%
13/10/05 16:26:09 INFO mapreduce.Job: Job job_1381015536254_0001 completed successfully
13/10/05 16:26:09 INFO mapreduce.Job: Counters: 26
	File System Counters
		FILE: Number of bytes read=0
		FILE: Number of bytes written=76741
		FILE: Number of read operations=0
		FILE: Number of large read operations=0
		FILE: Number of write operations=0
		HDFS: Number of bytes read=48
		HDFS: Number of bytes written=0
		HDFS: Number of read operations=1
		HDFS: Number of large read operations=0
		HDFS: Number of write operations=0

With mapped job -status command, it shows:

Uber job : false
Number of maps: 1
Number of reduces: 0
map() completion: 1.0
reduce() completion: NaN
Job state: SUCCEEDED
retired: false
reason for failure: