# High network traffic between nodes in cluster

**URL:** <https://discuss.elastic.co/t/high-network-traffic-between-nodes-in-cluster/72641>\
**Category:** Elasticsearch\
**Created:** [January 24, 2017, 2:12pm UTC](https://discuss.elastic.co/t/high-network-traffic-between-nodes-in-cluster/72641 "2017-01-24T14:12:46Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![crs](https://avatars.discourse-cdn.com/v4/letter/c/977dab/32.png) [@crs](https://discuss.elastic.co/u/crs)\
**Post date:** [January 24, 2017, 2:12pm UTC](https://discuss.elastic.co/t/high-network-traffic-between-nodes-in-cluster/72641/1 "2017-01-24T14:12:46Z")

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Hi,

From time to time (several times a day) I can observe high traffic (100Mbps or more) lasting a few minutes between different pairs of nodes in cluster (ES 1.7.x) while there are no any ongoing replicas / relocation. For sure it's between nodes in clusters - I checked it on iftop. Any idea how to debug it? Standard log with INFO level doesn't show anything, enabling DEBUG shows too much info so I can't pinpoint culprit.

Kind regards -  
Krzysztof Księżyk

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**Author:** ![JKhondhu](https://avatars.discourse-cdn.com/v4/letter/j/ed655f/32.png) [@JKhondhu](https://discuss.elastic.co/u/JKhondhu)\
**Post date:** [January 24, 2017, 6:55pm UTC](https://discuss.elastic.co/t/high-network-traffic-between-nodes-in-cluster/72641/2 "2017-01-24T18:55:51Z")

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Do you employ X-Pack: Monitoring? Or more relative to your version, marvel?

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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 21, 2017, 6:56pm UTC](https://discuss.elastic.co/t/high-network-traffic-between-nodes-in-cluster/72641/3 "2017-02-21T18:56:15Z")

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