# Which Logstash plugins are not thread safe?

**URL:** <https://discuss.elastic.co/t/which-logstash-plugins-are-not-thread-safe/134600>\
**Category:** Logstash\
**Created:** [June 5, 2018, 11:10am UTC](https://discuss.elastic.co/t/which-logstash-plugins-are-not-thread-safe/134600 "2018-06-05T11:10:22Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dr01](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dr01/32/8482_2.png) [@dr01](https://discuss.elastic.co/u/dr01)\
**Post date:** [June 5, 2018, 11:10am UTC](https://discuss.elastic.co/t/which-logstash-plugins-are-not-thread-safe/134600/1 "2018-06-05T11:10:22Z")

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We just upgraded our Logstash server to a machine with multiple CPU cores, so we increased the number of pipeline workers from 1 to 4.  
Which Logstash plugins are not thread safe, and can therefore cause problems with parallel pipelines?

Thanks in advance.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 3, 2018, 11:10am UTC](https://discuss.elastic.co/t/which-logstash-plugins-are-not-thread-safe/134600/2 "2018-07-03T11:10:27Z")

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