1) After network goes down, they loose communication with each other. After that, they are becoming split. 2) They both think they are masters. Even if they think they are masters, shouldn't the ping happen to see if there are other nodes in the cluster ? 3) Number of replicas is set to 1. If ES doesn't differentiate, why are some shards primary and others replica ?
On Monday, 4 May 2015 10:48:24 UTC+5:30, Mark Walkom wrote: > > > 1. Why are they becoming split anyway? GC, other load, network? > 2. Not if they both think they are masters. > 3. Are you running replicas? If so ES doesn't really differentiate > between the two. > > > On 4 May 2015 at 15:03, Gourav H Dhelaria <gouravd...@gmail.com > <javascript:>> wrote: > >> Version: 1.4. >> Say there are 2 nodes X and Y, both capable of becoming master. >> When network goes down, both nodes get disconnected from each other and >> assume the responsibility of master. >> When network is restored, they don't ping each other and form a cluster. >> >> Elasticsearch service has to be restarted on any one of the nodes for >> them to form a cluster. Even after they form a cluster, all primary shards >> remain on one node ( on which the service was restarted ), and all replica >> shards are on the other node. >> >> >> This document >> >> >> http://www.elastic.co/guide/en/elasticsearch/guide/current/_important_configuration_changes.html >> >> >> mentions that there has to be an uneven number of master eligible nodes. >> >> >> Queries: >> >> >> 1) Is there a way of avoiding split brain problem in 2 node cluster ? >> >> 2) After network is restored, shouldn't the nodes ping each other and >> form a cluster ? >> >> 3) After the service is restarted to form the cluster, why don't the >> primary shards get distributed on both the nodes ? >> >> >> >> Thanks, >> >> Gourav >> >> -- >> 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 <javascript:>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/elasticsearch/d15234b3-0ea1-4390-b136-2f02f69cd3f5%40googlegroups.com >> >> <https://groups.google.com/d/msgid/elasticsearch/d15234b3-0ea1-4390-b136-2f02f69cd3f5%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > > -- 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+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/elasticsearch/bf7a9953-bc87-4b96-843d-7bff5899855f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
