# Question regarding ES distribution of incoming requests

**URL:** <https://discuss.elastic.co/t/question-regarding-es-distribution-of-incoming-requests/260268>\
**Category:** Elasticsearch\
**Created:** [January 6, 2021, 3:19am UTC](https://discuss.elastic.co/t/question-regarding-es-distribution-of-incoming-requests/260268 "2021-01-06T03:19:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Amlan\_Kumar\_Rath](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/amlan_kumar_rath/32/81284_2.png) [@Amlan\_Kumar\_Rath](https://discuss.elastic.co/u/Amlan_Kumar_Rath)\
**Post date:** [January 6, 2021, 3:19am UTC](https://discuss.elastic.co/t/question-regarding-es-distribution-of-incoming-requests/260268/1 "2021-01-06T03:19:53Z")

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I have a 3 node cluster with 6 indices of 1 shard each and 2 replicas, in short the full copy of an index on each node. Now I know that when I make a search call by calling a particular node of the cluster with a query, ES uses Adaptive Replica Selection to redirect my query to a particular node in the cluster which may or may not be the same node which I called to.

SO I tried calling ES cluster in the following way with the same load of 1000 requests per second.

Case 1 - Called just one node and ignored other two for every request, got a RPS of 130  
Case 2 - Randomly chose between only 2 nodes and ignored the third nodeto make a request, got a RPS of 200  
Case 3 - Randomly chose between all 3 nodes of cluster to make a request, got a RPS of 250

I don't understand why would there be a difference on how many nodes of a cluster I call to, since every request is handled using adaptive replica selection by ES.

Can anybody please shed some light on this, or provide some insight on what actually is happening ?

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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:** [February 3, 2021, 3:19am UTC](https://discuss.elastic.co/t/question-regarding-es-distribution-of-incoming-requests/260268/2 "2021-02-03T03:19:54Z")

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