# Understanding DEBUG lines - Tuning Opportunity?

**URL:** https://discuss.elastic.co/t/understanding-debug-lines-tuning-opportunity/48345
**Category:** Beats
**Tags:** filebeat
**Created:** [April 25, 2016, 6:47pm UTC](https://discuss.elastic.co/t/understanding-debug-lines-tuning-opportunity/48345 "2016-04-25T18:47:27Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![steffens](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/steffens/32/79630_2.png) [@steffens](https://discuss.elastic.co/u/steffens)
#### Post date: [April 25, 2016, 10:19pm UTC](https://discuss.elastic.co/t/understanding-debug-lines-tuning-opportunity/48345/2 "2016-04-25T22:19:03Z")

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just seeing these 2 messages is kind of out of context. without complete log I can not tell what's exactly happening. The window size does grow starting at 10 up to bulk\_max\_size. If logstash stops responding, the window-size will stop growing and might shrink instead.

Somewhat related: [Logstash output load balancing and workers settings](https://discuss.elastic.co/t/logstash-output-load-balancing-and-workers-settings/48176)

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