[MESOS-9067] Improve performance of json parsing by avoiding conversion cost.

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.7.0
• Component/s: stout
• Labels: performance
• Assignee: Benjamin Mahler
• Reporter: Benjamin Mahler
• Created: 10/Jul/18 19:39
• Updated: 10/Jul/18 19:43
• Resolved: 10/Jul/18 19:42

Description

Stout's JSON parsing function parses into picojson::value followed by converting to JSON::Value. This carries a significant conversion cost (almost doubling the parse time).

We can leverage picojson's parsing context to avoid this cost.