# Continus writting will cause segment merge, therefore cause filter cache invalid, is it way to monitor this?

**URL:** <https://discuss.elastic.co/t/continus-writting-will-cause-segment-merge-therefore-cause-filter-cache-invalid-is-it-way-to-monitor-this/52960>\
**Category:** Elasticsearch\
**Created:** [June 16, 2016, 7:50am UTC](https://discuss.elastic.co/t/continus-writting-will-cause-segment-merge-therefore-cause-filter-cache-invalid-is-it-way-to-monitor-this/52960 "2016-06-16T07:50:01Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![makeyang](https://avatars.discourse-cdn.com/v4/letter/m/f05b48/32.png) [@makeyang](https://discuss.elastic.co/u/makeyang)\
**Post date:** [June 16, 2016, 7:50am UTC](https://discuss.elastic.co/t/continus-writting-will-cause-segment-merge-therefore-cause-filter-cache-invalid-is-it-way-to-monitor-this/52960/1 "2016-06-16T07:50:01Z")

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my cluster cover a search request with a lot of new data indexed, then the search performce will drop greatly time by time. is there a way to monitor the invalid of the filter cache caused by segment merge?

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**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [June 18, 2016, 1:27am UTC](https://discuss.elastic.co/t/continus-writting-will-cause-segment-merge-therefore-cause-filter-cache-invalid-is-it-way-to-monitor-this/52960/2 "2016-06-18T01:27:59Z")

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Any segment merges invalidates filter caches, as they are on a segment level.

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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 5, 2017, 10:42pm UTC](https://discuss.elastic.co/t/continus-writting-will-cause-segment-merge-therefore-cause-filter-cache-invalid-is-it-way-to-monitor-this/52960/3 "2017-07-05T22:42:37Z")

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