# Connection Pool Limit in Elastic Search Server or Client

**URL:** <https://discuss.elastic.co/t/connection-pool-limit-in-elastic-search-server-or-client/111426>\
**Category:** Elasticsearch\
**Created:** [December 12, 2017, 7:57pm UTC](https://discuss.elastic.co/t/connection-pool-limit-in-elastic-search-server-or-client/111426 "2017-12-12T19:57:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![antonpious](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/antonpious/32/31885_2.png) [@antonpious](https://discuss.elastic.co/u/antonpious)\
**Post date:** [December 12, 2017, 7:57pm UTC](https://discuss.elastic.co/t/connection-pool-limit-in-elastic-search-server-or-client/111426/1 "2017-12-12T19:57:37Z")

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Is there a Connect Pool Limit in either the Elastic Search Server or Java Client.

If we have 1 Node, how many concurrent connections or calls can be made to this node.

If we have N Nodes, how many concurrent connections or calls can be made to all nodes.

How do we increase this limit?

Basically what we are noticing is after request rate / second 25 K - 30 K we are not able to increase this per node.

The search rate is 3500/ Second max for 7 node cluster

The other is the loads are going only to a couple of the nodes of the 7 and the rest of the nodes are idle. There are 5 Shards per index only 1 shard is present in the node, why is it going only to these 2 nodes.

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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 9, 2018, 7:58pm UTC](https://discuss.elastic.co/t/connection-pool-limit-in-elastic-search-server-or-client/111426/2 "2018-01-09T19:58:03Z")

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