Issue #2892 has been updated by Josh Cooper.

Status changed from In Topic Branch Pending Review to Merged - Pending Release
Target version changed from 2.7.x to 2.7.20

This was merge into 3.x in b0bc704. Because we like to backport things, it was 
later merged into 2.7.x in ba96917
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Bug #2892: Improve performance when caching catalog in puppet agent.
https://projects.puppetlabs.com/issues/2892#change-71327

Author: Brice Figureau
Status: Merged - Pending Release
Priority: Normal
Assignee: Daniel Pittman
Category: plumbing
Target version: 2.7.20
Affected Puppet version: 0.25.1
Keywords: pson json catalog cache serialization
Branch: https://github.com/puppetlabs/puppet/pull/930


Peter Meier noticed that the puppetd catalog caching was an operation that was 
taking lots of RAM.
Analysis show that for large catalog YAML dumping consumes lots of memory 
(roughly 3x times the object to serialize).

The catalog is sent from the master to the client in serialized format (usually 
pson/json), the idea would be to directly use it as the local client cache, 
instead of re-serializing the "live" catalog.

One possible implementation would be:

 * keep the serialized version of the catalog in the request in the REST client
 * when caching the catalog, have a specific terminus that would just dump this 
string to disk

This has been regularly observed in the field as being a significant 
performance cost, especially when performing interactive Puppet runs to debug 
issues interactively.


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