# Grok\_timeout coming in logstash logs

**URL:** <https://discuss.elastic.co/t/grok-timeout-coming-in-logstash-logs/348623>\
**Category:** Logstash\
**Created:** [December 5, 2023, 9:38am UTC](https://discuss.elastic.co/t/grok-timeout-coming-in-logstash-logs/348623 "2023-12-05T09:38:55Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Biswajit\_naik](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/biswajit_naik/32/126752_2.png) [@Biswajit\_naik](https://discuss.elastic.co/u/Biswajit_naik)\
**Post date:** [December 5, 2023, 9:38am UTC](https://discuss.elastic.co/t/grok-timeout-coming-in-logstash-logs/348623/1 "2023-12-05T09:38:55Z")

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when i process multiple type of logs by grok parser ,if the one of logline is not matched with the filter parser ,then i am excepting that it should be come grok parser faliure ,but it comes grok timeout warning in Logstash logs.

if its coming grok timeout why it takes so longer time?can i reduce the process time ,then its return warnings in logs.

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**Author:** ![Rios](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rios/32/95745_2.png) [@Rios](https://discuss.elastic.co/u/Rios)\
**Post date:** [December 5, 2023, 10:08am UTC](https://discuss.elastic.co/t/grok-timeout-coming-in-logstash-logs/348623/2 "2023-12-05T10:08:53Z")

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The grok timeout can be caused by:

- wrong fields type for instance too often GREEDYDATA is used - no optimization
- use multi match patterns instead of optional fields or OR fields
- not measuring data performances, by node/[pipeline stat](https://www.elastic.co/guide/en/logstash/current/node-stats-api.html#pipeline-stats)
- using grok instead dissect, csv, kv ...
- poor memory/CPU resources
- too many log fields

I would check by this order. Sometimes is better to go for another plugin, if is possible. The default timeout is 30 sec, however anything above 3-5 sec in case of plain lines is a signal for the optimization.

In your case, it's hard to say without sample messageS and grok patternS which you use.

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**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [December 5, 2023, 5:25pm UTC](https://discuss.elastic.co/t/grok-timeout-coming-in-logstash-logs/348623/3 "2023-12-05T17:25:00Z")

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Also, anchor your patterns. Read [this](https://www.elastic.co/blog/do-you-grok-grok) blog post.

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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:** [January 2, 2024, 5:25pm UTC](https://discuss.elastic.co/t/grok-timeout-coming-in-logstash-logs/348623/4 "2024-01-02T17:25:33Z")

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