# Master not discovered exception

**URL:** <https://discuss.elastic.co/t/master-not-discovered-exception/309677>\
**Category:** Elasticsearch\
**Created:** [July 14, 2022, 5:34pm UTC](https://discuss.elastic.co/t/master-not-discovered-exception/309677 "2022-07-14T17:34:04Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![NadyLeez123](https://avatars.discourse-cdn.com/v4/letter/n/7bcc69/32.png) [@NadyLeez123](https://discuss.elastic.co/u/NadyLeez123)\
**Post date:** [July 14, 2022, 5:34pm UTC](https://discuss.elastic.co/t/master-not-discovered-exception/309677/1 "2022-07-14T17:34:04Z")

</div>

We have an elasticsearch cluster of 2 masters et 6 data nodes since 2 years. Yesterday, requests became very slow, we started experiencing a time out in elasticsearch and kibana.

We then discovered this on one of the two master nodes:

```auto

(SFPP....) /home/rmen023 $curl -X GET "server:9200/_ cluster/health?pretty" 
Enter host password :
{
  "error" : {
    "root_cause" : [
      {
        "type" : "master_not_discovered_exception",
        "reason" : null
      }
    ],
    "type" : "master_not_discovered_exception",
    "reason" : null
  },
  "status" : 503
}

```

Any idea? It is the first time for us to see this.

---

<div class="post-metadata">

**Author:** ![hendry.lim](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/hendry.lim/32/71328_2.png) [@hendry.lim](https://discuss.elastic.co/u/hendry.lim)\
**Post date:** [July 15, 2022, 1:36am UTC](https://discuss.elastic.co/t/master-not-discovered-exception/309677/2 "2022-07-15T01:36:57Z")

</div>

Would it be possible for you to share the Elasticsearch logs?

---

<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:** [August 12, 2022, 1:37am UTC](https://discuss.elastic.co/t/master-not-discovered-exception/309677/3 "2022-08-12T01:37:19Z")

</div>

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