[KUDU-1282] Add more tracing for thread startup

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.6.0
• Fix Version/s: 0.7.0
• Component/s: util
• Target Version/s: 0.7.0
• Code Review: http://gerrit.cloudera.org:8080/#/c/1651/
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 15/Dec/15 19:15
• Updated: 06/Jan/16 23:59
• Resolved: 06/Jan/16 23:59

Description

Looking at logs on decster's cluster last week, we saw some warnings that threads were taking >0.5sec to start in some cases. It wasn't really clear why. We should add more fine-grained tracing or timing to understand this latency outlier.