# Cluster\_block\_exception - SERVICE\_UNAVAILABLE/2/no master
**URL:** https://discuss.elastic.co/t/cluster-block-exception-service-unavailable-2-no-master/93190
**Category:** Elasticsearch
**Created:** [July 14, 2017, 12:48pm UTC](https://discuss.elastic.co/t/cluster-block-exception-service-unavailable-2-no-master/93190 "2017-07-14T12:48:37Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@SKumarMN](https://discuss.elastic.co/u/SKumarMN)
#### Post date: [July 14, 2017, 12:48pm UTC](https://discuss.elastic.co/t/cluster-block-exception-service-unavailable-2-no-master/93190/1 "2017-07-14T12:48:37Z")
Mine is a three node ES cluster running 2.3.2. I am using REST API's and carrying out bulk indexing. I see this response
{"error":{"root\_cause":[{"type":"cluster\_block\_exception","reason":"blocked by: [SERVICE\_UNAVAILABLE/2/no master];"}],"type":"cluster\_block\_exception","reason":"blocked by: [SERVICE\_UNAVAILABLE/2/no master];"},"status":503}
In the post [https://discuss.elastic.co/t/503-service-unavailable-2-no-master/64793](https://discuss.elastic.co/t/503-service-unavailable-2-no-master/64793), one of the member has mentioned that when a node joins master election triggers. Does the master election triggers every time a master eligible node joins or only when no master is present in the cluster currently ?
Also what might be other possible reasons one might encounter this issue
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [August 11, 2017, 12:49pm UTC](https://discuss.elastic.co/t/cluster-block-exception-service-unavailable-2-no-master/93190/2 "2017-08-11T12:49:01Z")
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