# Split-brain rejoining?

**URL:** <https://discuss.elastic.co/t/split-brain-rejoining/8851>\
**Category:** Elasticsearch\
**Created:** [August 26, 2012, 4:15pm UTC](https://discuss.elastic.co/t/split-brain-rejoining/8851 "2012-08-26T16:15:53Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Antonio\_Lobato](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/antonio_lobato/32/2681_2.png) [@Antonio\_Lobato](https://discuss.elastic.co/u/Antonio_Lobato)\
**Post date:** [August 26, 2012, 4:15pm UTC](https://discuss.elastic.co/t/split-brain-rejoining/8851/1 "2012-08-26T16:15:53Z")

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The topic pretty much sums it up. If I have a cluster that split brains,  
is there a way for them to rejoin into a single cluster without having to  
reboot the part that split off? One software that comes to mind that does  
this is Hazelcast (another java based product).

If this isn't possible, then consider this a feature request! Nodes should  
try to relink to other nodes on a regular basis, via multicast if it's  
enabled, or unicast.

Thanks 😃

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**Author:** ![Richard\_Vowles](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/richard_vowles/32/2747_2.png) [@Richard\_Vowles](https://discuss.elastic.co/u/Richard_Vowles)\
**Post date:** [August 30, 2012, 2:36am UTC](https://discuss.elastic.co/t/split-brain-rejoining/8851/2 "2012-08-30T02:36:37Z")

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This appears to be a regular request (once every few days). We are in a  
situation where we are running two nodes - one in each data centre. If the  
link goes down for a prolonged period of time (we have been testing it with  
low ping timeouts to simulate this) then they never, ever attempt to  
reconnect, and both sides become master. The next attempt is to try and  
force one of them to never be master, so it won't accept POST request  
updates which is a nasty hack and means devops have to do work to recover  
it, and if that doesn't work, we'll have to fall back to getting the  
clusters status before posting.

Ideally there should be another setting that tells Zen to check every x  
seconds after a failure.

On Monday, August 27, 2012 4:15:53 AM UTC+12, Antonio Lobato wrote:

> The topic pretty much sums it up. If I have a cluster that split brains,  
> is there a way for them to rejoin into a single cluster without having to  
> reboot the part that split off? One software that comes to mind that does  
> this is Hazelcast (another java based product).
> 
> If this isn't possible, then consider this a feature request! Nodes  
> should try to relink to other nodes on a regular basis, via multicast if  
> it's enabled, or unicast.
> 
> Thanks 😃

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**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, 3:14am UTC](https://discuss.elastic.co/t/split-brain-rejoining/8851/3 "2017-07-06T03:14:40Z")

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Closed on July 6, 2017, 3:14am UTC