The JIRA for this is TS-1969.

Proposed Solution

• Complete config reload (for all those possible that are not covered today)
  • Cover config files not covered today
    • traffic_line -x inventory
    • RecordsConfig.cc review for correctness
  • Make a generic way to signal plugins of their config change
  • Load new plugins
• Drain connections
  • Header Rewrite Plugin?
• Restart TS in the background
  • Start new process
  • Bind same ports
  • Read only cache
  • Cache hand over
  • Ram cache handover

A drain option has been added to the traffic_ctl command.  See commit 

2107f0f675dc084f5a829cb6268eee5a19c1e12c