# Non-unique log filename get overwritten?

**URL:** <https://discuss.elastic.co/t/non-unique-log-filename-get-overwritten/7311>\
**Category:** Elasticsearch\
**Created:** [April 12, 2012, 3:13pm UTC](https://discuss.elastic.co/t/non-unique-log-filename-get-overwritten/7311 "2012-04-12T15:13:55Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![coldfission](https://avatars.discourse-cdn.com/v4/letter/c/e99b99/32.png) [@coldfission](https://discuss.elastic.co/u/coldfission)\
**Post date:** [April 12, 2012, 3:13pm UTC](https://discuss.elastic.co/t/non-unique-log-filename-get-overwritten/7311/1 "2012-04-12T15:13:55Z")

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In config/logging.yml:

If I change  
datePattern: "'.'yyyy-MM-dd"  
to  
datePattern: "'.'dd"

Will the old log files be overwritten correctly once non-unique log  
filenames exist?

thanks

---

<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:** [July 6, 2017, 3:32am UTC](https://discuss.elastic.co/t/non-unique-log-filename-get-overwritten/7311/2 "2017-07-06T03:32:50Z")

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Closed on July 6, 2017, 3:32am UTC