# Persistent queue not working?

**URL:** <https://discuss.elastic.co/t/persistent-queue-not-working/245852>\
**Category:** Logstash\
**Created:** [August 21, 2020, 4:57am UTC](https://discuss.elastic.co/t/persistent-queue-not-working/245852 "2020-08-21T04:57:40Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![TomHome](https://avatars.discourse-cdn.com/v4/letter/t/53a042/32.png) [@TomHome](https://discuss.elastic.co/u/TomHome)\
**Post date:** [August 21, 2020, 4:57am UTC](https://discuss.elastic.co/t/persistent-queue-not-working/245852/1 "2020-08-21T04:57:40Z")

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Hi,

I'd like to use Persistent Queues (PQ) as an internal overflow buffer when we get spikes of logs into our redis instance (input redis {} in each pipeline). But the PQ does not grow despite our redis instance being saturated with logs. There is a key in redis for each pipeline. Redis keys are updated by filebeat clients (7.5.x)

How to debug to find the bottleneck?

Environment: Ubuntu + ELK stack : 7.9.0 + pipelines

Note: PQ used to buffer fine when we used ELK 6.6.8 and a single logstash.conf (no pipelines).

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [September 18, 2020, 4:57am UTC](https://discuss.elastic.co/t/persistent-queue-not-working/245852/2 "2020-09-18T04:57:43Z")

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