[YARN-2867] TimelineClient DT methods should check if the timeline service is enabled or not

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Invalid
• Affects Version/s: 2.6.0
• Target Version/s: 2.7.0
• Assignee: Unassigned
• Reporter: Zhijie Shen
• Created: 14/Nov/14 22:07
• Updated: 10/Apr/15 20:09
• Resolved: 14/Nov/14 22:49

Description

DT related methods doesn't check if isEnabled == true. On the other side, the internal stuff is only inited when isEnabled == true. NPE happens if users call these methods when the timeline service config is not set to enabled.