# Does elasticsearch send discovery ping to each other after cluster is formed?

**URL:** <https://discuss.elastic.co/t/does-elasticsearch-send-discovery-ping-to-each-other-after-cluster-is-formed/80445>\
**Category:** Elasticsearch\
**Created:** [March 29, 2017, 9:11am UTC](https://discuss.elastic.co/t/does-elasticsearch-send-discovery-ping-to-each-other-after-cluster-is-formed/80445 "2017-03-29T09:11:58Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![YuWatanabe](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/yuwatanabe/32/13259_2.png) [@YuWatanabe](https://discuss.elastic.co/u/YuWatanabe)\
**Post date:** [March 29, 2017, 9:11am UTC](https://discuss.elastic.co/t/does-elasticsearch-send-discovery-ping-to-each-other-after-cluster-is-formed/80445/1 "2017-03-29T09:11:58Z")

</div>

Hello

I would like to confirm one thing about ZenDiscovery pinging.

Assuming there is single cluster including nodes a,b,c, once the cluster is formed, do all the nodes do zen discovery pinging to each other?

My understanding is below.

a -\> b  
a -\> c  
b -\> a  
b -\> c  
c -\> a  
c -\> b

[Definitive guide](https://www.elastic.co/guide/en/elasticsearch/guide/2.x/important-configuration-changes.html#unicast) seems to not clarify this part so I asked the question.

---

<div class="post-metadata">

**Author:** ![jasontedor](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jasontedor/32/66992_2.png) [@jasontedor](https://discuss.elastic.co/u/jasontedor)\
**Post date:** [March 29, 2017, 4:31pm UTC](https://discuss.elastic.co/t/does-elasticsearch-send-discovery-ping-to-each-other-after-cluster-is-formed/80445/2 "2017-03-29T16:31:55Z")

</div>

After the cluster is formed, each node will send periodic fault-detection pings to the master, and the master will send periodic fault-detection pings to each node that has joined it. Otherwise, the nodes do not ping each other.

---

<div class="post-metadata">

**Author:** ![YuWatanabe](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/yuwatanabe/32/13259_2.png) [@YuWatanabe](https://discuss.elastic.co/u/YuWatanabe)\
**Post date:** [March 29, 2017, 8:13pm UTC](https://discuss.elastic.co/t/does-elasticsearch-send-discovery-ping-to-each-other-after-cluster-is-formed/80445/3 "2017-03-29T20:13:24Z")

</div>

@jasontedor

Thank you for the reply. I now clearly understand.

---

<div class="post-metadata">

**Author:** ![jasontedor](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jasontedor/32/66992_2.png) [@jasontedor](https://discuss.elastic.co/u/jasontedor)\
**Post date:** [March 29, 2017, 8:28pm UTC](https://discuss.elastic.co/t/does-elasticsearch-send-discovery-ping-to-each-other-after-cluster-is-formed/80445/4 "2017-03-29T20:28:41Z")

</div>

You're welcome.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [April 26, 2017, 8:28pm UTC](https://discuss.elastic.co/t/does-elasticsearch-send-discovery-ping-to-each-other-after-cluster-is-formed/80445/5 "2017-04-26T20:28:42Z")

</div>

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.