[MAPREDUCE-5905] CountersStrings.toEscapedCompactStrings outputs unnecessary "null" strings

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.4.0, 2.7.0
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Target Version/s: 2.8.0
• Hadoop Flags: Reviewed
• Assignee: Akira Ajisaka
• Reporter: Akira Ajisaka
• Created: 27/May/14 05:12
• Updated: 30/Aug/16 01:20
• Resolved: 04/May/15 06:04

Description

CountersStrings.toEscapedCompactStrings outputs "null" strings if a CounterGroup has more than one Counter.

That way there are some "null" strings in MRv1(CDH) job history log.
https://issues.cloudera.org/browse/DISTRO-598