Issue #17108 has been updated by Charlie Sharpsteen.

Redmine Issue [#17108](http://projects.puppetlabs.com/issues/17108) has been 
migrated to JIRA:

  <https://tickets.puppetlabs.com/browse/PDB-139>


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Feature #17108: "Degraded mode" that allows Puppet to operate when PuppetDB is 
down - with queues and cache
https://projects.puppetlabs.com/issues/17108#change-101450

* Author: Deepak Giridharagopal
* Status: Needs Decision
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
* Keywords: backlog
* Branch: 
* Affected PuppetDB version: 
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Many current PuppetDB users are managing HA themselves, by setting up HTTP load 
balancers and PostgreSQL replication on their own.

Architecturally, I think we could reasonably offer application-level HA...a 
system that would be easier to setup, and would have relaxed consistency 
guarantees compared to more hardcore (and more complicated) database 
replication.

Ideas:

* the terminus code can spool write requests to disk in the event of downstream 
failure, and flush that queue when connectivity is re-established

* the terminus code can cache collection queries for a configurable amount of 
time. the cache is consulted only during failure scenarios, to allow for 
continued (albeit degraded) operation.


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