# Fwd: minimum\_master\_nodes is explained conflict in elasticsearch.yml and Guide docs **URL:** \ **Category:** Elasticsearch\ **Created:** [December 13, 2013, 1:58am UTC](https://discuss.elastic.co/t/fwd-minimum-master-nodes-is-explained-conflict-in-elasticsearch-yml-and-guide-docs/14848 "2013-12-13T01:58:33Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![liangwb2001](https://avatars.discourse-cdn.com/v4/letter/l/57b2e6/32.png) [@liangwb2001](https://discuss.elastic.co/u/liangwb2001)\ **Post date:** [December 13, 2013, 1:58am UTC](https://discuss.elastic.co/t/fwd-minimum-master-nodes-is-explained-conflict-in-elasticsearch-yml-and-guide-docs/14848/1 "2013-12-13T01:58:33Z")
Hi, I have a doubt point when setup a 3 master nodes cluster. Cause the minimum\_master\_nodes option's annotation in elasticsearch.yml: #Set to ensure a node sees N other master eligible nodes to be considered operational within the cluster. Set this option to a higher value (2-4) for large clusters (\>3 nodes). ``` it means minimum_master_nodes not include current node self. so ``` minimum\_master\_nodes=N/2; but in [http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/modules-discovery-zen.html#master-election:](http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/modules-discovery-zen.html#master-election:) #The discovery.zen.minimum\_master\_nodes allows to control the minimum number of master eligible nodes a node should "see" in order to operate within the cluster. Its recommended to set it to a higher value than 1 when running more than 2 nodes in the cluster. ``` it means minimum_master_nodes should include current node self. so ``` minimum\_master\_nodes=(N/2+1); Would anyOne tell me which is right? Thanks. -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CADm5%2BcqJ3xxUwyGbc%3DJpDACAMXTya1PAPQEsAYM%2Bb%3DU8LNud1A%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CADm5%2BcqJ3xxUwyGbc%3DJpDACAMXTya1PAPQEsAYM%2Bb%3DU8LNud1A%40mail.gmail.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [December 13, 2013, 2:27am UTC](https://discuss.elastic.co/t/fwd-minimum-master-nodes-is-explained-conflict-in-elasticsearch-yml-and-guide-docs/14848/2 "2013-12-13T02:27:19Z")
N/2+1 is the better choice. Regards, Mark Walkom Infrastructure Engineer Campaign Monitor email: [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com) web: [www.campaignmonitor.com](http://www.campaignmonitor.com) On 13 December 2013 12:58, Wenbo Liang [liangwb2001@gmail.com](mailto:liangwb2001@gmail.com) wrote: > Hi, I have a doubt point when setup a 3 master nodes cluster. Cause the > minimum\_master\_nodes option's annotation in elasticsearch.yml: > #Set to ensure a node sees N other master eligible nodes to be > considered operational within the cluster. Set this option to a higher > value (2-4) for large clusters (\>3 nodes). > > ``` > it means minimum_master_nodes not include current node self. so > > ``` > > minimum\_master\_nodes=N/2; > > but in > [Elasticsearch Platform — Find real-time answers at scale | Elastic](http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/modules-discovery-zen.html#master-election:) > #The discovery.zen.minimum\_master\_nodes allows to control the minimum > number of master eligible nodes a node should "see" in order to operate > within the cluster. Its recommended to set it to a higher value than 1 when > running more than 2 nodes in the cluster. > > ``` > it means minimum_master_nodes should include current node self. so > > ``` > > minimum\_master\_nodes=(N/2+1); > > Would anyOne tell me which is right? Thanks. > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/CADm5%2BcqJ3xxUwyGbc%3DJpDACAMXTya1PAPQEsAYM%2Bb%3DU8LNud1A%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CADm5%2BcqJ3xxUwyGbc%3DJpDACAMXTya1PAPQEsAYM%2Bb%3DU8LNud1A%40mail.gmail.com) > . > For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAEM624bT8xDF0NRC1duq6k1Z35%3DNW58WHsnEXVM%3DdCHLyMRVRQ%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAEM624bT8xDF0NRC1duq6k1Z35%3DNW58WHsnEXVM%3DdCHLyMRVRQ%40mail.gmail.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![liangwb2001](https://avatars.discourse-cdn.com/v4/letter/l/57b2e6/32.png) [@liangwb2001](https://discuss.elastic.co/u/liangwb2001)\ **Post date:** [December 13, 2013, 4:55am UTC](https://discuss.elastic.co/t/fwd-minimum-master-nodes-is-explained-conflict-in-elasticsearch-yml-and-guide-docs/14848/3 "2013-12-13T04:55:51Z")
Thank you so quick answer ---
**Author:** ![Boaz\_Leskes](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/boaz_leskes/32/723_2.png) [@Boaz\_Leskes](https://discuss.elastic.co/u/Boaz_Leskes)\ **Post date:** [December 15, 2013, 10:22am UTC](https://discuss.elastic.co/t/fwd-minimum-master-nodes-is-explained-conflict-in-elasticsearch-yml-and-guide-docs/14848/4 "2013-12-15T10:22:55Z")
Wenbo, The minimum master node calculations always include the current node (unless node.master is set to false, or node.client=true in elasticsearch.yml). I will update the elasticsearch.yml comment to match the docs. Thanks, Boaz On Friday, December 13, 2013 3:27:19 AM UTC+1, Mark Walkom wrote: > N/2+1 is the better choice. > > Regards, > Mark Walkom > > Infrastructure Engineer > Campaign Monitor > email: [ma...@campaignmonitor.com](mailto:ma...@campaignmonitor.com) \ > web: [www.campaignmonitor.com](http://www.campaignmonitor.com) > > On 13 December 2013 12:58, Wenbo Liang \<[liang...@gmail.com](mailto:liang...@gmail.com) \\>wrote: > > > Hi, I have a doubt point when setup a 3 master nodes cluster. Cause the > > minimum\_master\_nodes option's annotation in elasticsearch.yml: > > #Set to ensure a node sees N other master eligible nodes to be > > considered operational within the cluster. Set this option to a higher > > value (2-4) for large clusters (\>3 nodes). > > > > ``` > > it means minimum_master_nodes not include current node self. so > > > > ``` > > > > minimum\_master\_nodes=N/2; > > > > but in > > [Elasticsearch Platform — Find real-time answers at scale | Elastic](http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/modules-discovery-zen.html#master-election:) > > #The discovery.zen.minimum\_master\_nodes allows to control the minimum > > number of master eligible nodes a node should "see" in order to operate > > within the cluster. Its recommended to set it to a higher value than 1 when > > running more than 2 nodes in the cluster. > > > > ``` > > it means minimum_master_nodes should include current node self. so > > > > ``` > > > > minimum\_master\_nodes=(N/2+1); > > > > Would anyOne tell me which is right? Thanks. > > > > -- > > You received this message because you are subscribed to the Google Groups > > "elasticsearch" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [elasticsearc...@googlegroups.com](mailto:elasticsearc...@googlegroups.com) \. > > To view this discussion on the web visit > > [https://groups.google.com/d/msgid/elasticsearch/CADm5%2BcqJ3xxUwyGbc%3DJpDACAMXTya1PAPQEsAYM%2Bb%3DU8LNud1A%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CADm5%2BcqJ3xxUwyGbc%3DJpDACAMXTya1PAPQEsAYM%2Bb%3DU8LNud1A%40mail.gmail.com) > > . > > For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/2b6ba437-ebd9-4cab-a425-9cc56eb4d323%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/2b6ba437-ebd9-4cab-a425-9cc56eb4d323%40googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![liangwb2001](https://avatars.discourse-cdn.com/v4/letter/l/57b2e6/32.png) [@liangwb2001](https://discuss.elastic.co/u/liangwb2001)\ **Post date:** [December 23, 2013, 6:00am UTC](https://discuss.elastic.co/t/fwd-minimum-master-nodes-is-explained-conflict-in-elasticsearch-yml-and-guide-docs/14848/5 "2013-12-23T06:00:28Z")
Thanks Boaz for so clear answer. ---
**Author:** ![Pradeep\_Gowda](https://avatars.discourse-cdn.com/v4/letter/p/ebca7d/32.png) [@Pradeep\_Gowda](https://discuss.elastic.co/u/Pradeep_Gowda)\ **Post date:** [July 17, 2015, 12:29am UTC](https://discuss.elastic.co/t/fwd-minimum-master-nodes-is-explained-conflict-in-elasticsearch-yml-and-guide-docs/14848/6 "2015-07-17T00:29:08Z")
I have a doubt when there are two nodes which are eligible to become master. What should be the best choice for discovery.zen.minimum\_master\_nodes in this scenario. According to document it is recommended to have minimum of 3 nodes. > If you have two regular nodes, you are in a conundrum. A quorum would be 2, but this means a loss of one node will make your cluster inoperable. A setting of 1 will allow your cluster to function, but doesn’t protect against split brain. It is best to have a minimum of three nodes in situations like this. How can I prevent split brain when there are only two nodes sitting on different machine? Regards, ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 12:00am UTC](https://discuss.elastic.co/t/fwd-minimum-master-nodes-is-explained-conflict-in-elasticsearch-yml-and-guide-docs/14848/7 "2017-07-06T00:00:53Z")