[SERVER-28736] Add instrumentation to note long running user provided callbacks on IO threads Created: 11/Apr/17  Updated: 31/Jul/17  Resolved: 31/Jul/17

Status: Closed
Project: Core Server
Component/s: Networking
Affects Version/s: None
Fix Version/s: None

Type: Task Priority: Major - P3
Reporter: Andrew Morrow (Inactive) Assignee: DO NOT USE - Backlog - Platform Team
Resolution: Won't Fix Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Backwards Compatibility: Fully Compatible
Sprint: Platforms 2017-04-17, Platforms 2017-08-21
Participants:

 Description   

Right now there is no protection against network layer worker threads being blocked by misbehaving callbacks. We can't easily prevent this behavior, but it would be possible to add instrumentation that would note (or, more aggressively, fail an invariant) if any callback out of the ASIO network layer ran beyond a certain configurable threshold.

If those warnings or invariants trip, it gives a good indication that a blocking callback may exist.


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