# How elasticsearch find data corruption

**URL:** <https://discuss.elastic.co/t/how-elasticsearch-find-data-corruption/143624>\
**Category:** Elasticsearch\
**Created:** [August 9, 2018, 3:56am UTC](https://discuss.elastic.co/t/how-elasticsearch-find-data-corruption/143624 "2018-08-09T03:56:52Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![saiergon](https://avatars.discourse-cdn.com/v4/letter/s/e95f7d/32.png) [@saiergon](https://discuss.elastic.co/u/saiergon)\
**Post date:** [August 9, 2018, 3:56am UTC](https://discuss.elastic.co/t/how-elasticsearch-find-data-corruption/143624/1 "2018-08-09T03:56:52Z")

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hi, all , i wonder how elasticsearch find data corruption. for example, if i have a index with a primary shard and a replica, if sometime, the replica data corrupted because of disk error, then when elasticsearch will find the data was corruped? does elasticsearch checksum the data in every read operation?

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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:** [September 6, 2018, 3:56am UTC](https://discuss.elastic.co/t/how-elasticsearch-find-data-corruption/143624/2 "2018-09-06T03:56:55Z")

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