# Where can I find history of explanation for shard allocation?

**URL:** <https://discuss.elastic.co/t/where-can-i-find-history-of-explanation-for-shard-allocation/69634>\
**Category:** Elasticsearch\
**Created:** [December 21, 2016, 4:39am UTC](https://discuss.elastic.co/t/where-can-i-find-history-of-explanation-for-shard-allocation/69634 "2016-12-21T04:39:22Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![anishm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/anishm/32/28796_2.png) [@anishm](https://discuss.elastic.co/u/anishm)\
**Post date:** [December 21, 2016, 4:39am UTC](https://discuss.elastic.co/t/where-can-i-find-history-of-explanation-for-shard-allocation/69634/1 "2016-12-21T04:39:22Z")

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Since the upgrade to Elasticsearch 5.0 we are seeing a lot of movement of shards. In fact, at times there are node\_failed exceptions received, but the node seems to be healthy and running elasticsearch correctly. There are spikes in indexing latencies seen at these moments. To investigate the same issue, I was trying to see the reason why Elasticsearch performed so many shard movements but couldn't find a relevant log message. The nodes data nodes are m4.2xlarge and masters are t2.medium.  
I know Monitoring does show the history of shard allocation movements, but it doesn't tell the reason why the allocations occured.

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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 18, 2017, 4:39am UTC](https://discuss.elastic.co/t/where-can-i-find-history-of-explanation-for-shard-allocation/69634/2 "2017-01-18T04:39:52Z")

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