Issue #21201 has been updated by Andrew Parker.

Status changed from Accepted to In Topic Branch Pending Review
Branch set to https://github.com/puppetlabs/puppet/pull/1847

Turns out removing code that tried to make puppet thread safe was much easier 
than I expected.

----------------------------------------
Refactor #21201: Remove "thread safety" code from puppet
https://projects.puppetlabs.com/issues/21201#change-96703

* Author: Andrew Parker
* Status: In Topic Branch Pending Review
* Priority: Normal
* Assignee: eric sorenson
* Category: 
* Target version: 3.x
* Affected Puppet version: 
* Keywords: backlog
* Branch: https://github.com/puppetlabs/puppet/pull/1847
----------------------------------------
The puppet master does not run in threaded environments. Even our use of 
webrick avoids threads (see 
<https://github.com/puppetlabs/puppet/blob/3251ebd2a08ab483d5a74f0e8950e4536f477e48/lib/puppet/network/http/webrick.rb#L31-L37>).
 However, there are large amounts of code and convoluted constructs dedicated 
to trying (and most likely failing) to make various subsystems in puppet 
thread-safe.

This extra code has multiple down-sides:

  * False sense of security that you can safely use puppet in a threaded 
environment
  * Hard to understand code and high WTF/second count that slows down 
development
  * Possible locking overhead at runtime that is not needed

I can't think of any upside to keeping these structures around.


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