# Quorum, consistency and datacenter awareness?

**URL:** <https://discuss.elastic.co/t/quorum-consistency-and-datacenter-awareness/2889>\
**Category:** Elasticsearch\
**Created:** [April 4, 2010, 5:20pm UTC](https://discuss.elastic.co/t/quorum-consistency-and-datacenter-awareness/2889 "2010-04-04T17:20:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![HubertChang](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/hubertchang/32/3352_2.png) [@HubertChang](https://discuss.elastic.co/u/HubertChang)\
**Post date:** [April 4, 2010, 5:20pm UTC](https://discuss.elastic.co/t/quorum-consistency-and-datacenter-awareness/2889/1 "2010-04-04T17:20:57Z")

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El ElasticSearch works in the cluster.  
Is there a quorum concept? If the replication factor is 2 or 3 and one  
replication fails, is the content still available?  
Is there a param to read from \_all\_replications and read from  
\_one\_replication to maintain the consitency?  
Will the replication be datacenter awared in the future?  
do these features depends on the gateway? Like Cassandra, all these features  
is ready.  
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, 4:24am UTC](https://discuss.elastic.co/t/quorum-consistency-and-datacenter-awareness/2889/2 "2017-07-06T04:24:52Z")

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