# 0.90.7 - split brain right out of the box

**URL:** <https://discuss.elastic.co/t/0-90-7-split-brain-right-out-of-the-box/14413>\
**Category:** Elasticsearch\
**Created:** [November 14, 2013, 6:20pm UTC](https://discuss.elastic.co/t/0-90-7-split-brain-right-out-of-the-box/14413 "2013-11-14T18:20:18Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![revdev\_2](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/revdev_2/32/1852_2.png) [@revdev\_2](https://discuss.elastic.co/u/revdev_2)\
**Post date:** [November 14, 2013, 6:20pm UTC](https://discuss.elastic.co/t/0-90-7-split-brain-right-out-of-the-box/14413/1 "2013-11-14T18:20:18Z")

</div>

Hi everyone,

set up a new 0.90.7 cluster with 5 machines. here are the relevant parts of  
the config:

cluster.routing.allocation.node\_initial\_primaries\_recoveries = 4  
cluster.routing.allocation.node\_concurrent\_recoveries = 2  
discovery.zen.minimum\_master\_nodes = 3  
gateway.recover\_after\_nodes = 3  
gateway.expected\_nodes = 5

the cluster was spun up using chef and the 5 processes came online about  
the same time (within 10s of each other) and immediately formed into a  
split brain where 4 nodes formed a cluster and one member decided to elect  
itself a master in a 1-member cluster. restarting that node caused it to  
join properly. my question is, how would it be possible for this scenario  
to occur given the settings above? does an es cluster require rolling  
start/restart?

thanks!  
-wayne

--  
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).  
For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out).

---

<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:** [July 6, 2017, 2:06am UTC](https://discuss.elastic.co/t/0-90-7-split-brain-right-out-of-the-box/14413/2 "2017-07-06T02:06:55Z")

</div>