# Merging two log sources

**URL:** <https://discuss.elastic.co/t/merging-two-log-sources/52091>\
**Category:** Logstash\
**Created:** [June 7, 2016, 2:28pm UTC](https://discuss.elastic.co/t/merging-two-log-sources/52091 "2016-06-07T14:28:43Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![falcon](https://avatars.discourse-cdn.com/v4/letter/f/49beb7/32.png) [@falcon](https://discuss.elastic.co/u/falcon)\
**Post date:** [June 7, 2016, 2:28pm UTC](https://discuss.elastic.co/t/merging-two-log-sources/52091/1 "2016-06-07T14:28:43Z")

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I need to merge access.log with application.log based on equal timestamp +/- delta, thread name and request URI to get one event (instead two) saved into DB. Is it possible with logstach or I need some preprocessing before using logstash?

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**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [June 10, 2016, 5:37am UTC](https://discuss.elastic.co/t/merging-two-log-sources/52091/2 "2016-06-10T05:37:45Z")

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Have you looked at the collate filter?

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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 6, 2017, 4:53am UTC](https://discuss.elastic.co/t/merging-two-log-sources/52091/3 "2017-07-06T04:53:45Z")

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