[SOLR-6205] Make SolrCloud Data-center, rack or zone aware

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Invalid
• Affects Version/s: 4.8.1
• Component/s: SolrCloud
• Assignee: Noble Paul
• Reporter: Arcadius Ahouansou
• Created: 25/Jun/14 21:27
• Updated: 01/Jul/20 13:08
• Resolved: 01/Jul/20 13:08

Description

Use case:

Let's say we have SolrCloud deployed across 2 Datacenters, racks or zones A and B

There is a need to have a SolrCloud deployment that will make it possible to have a working system even if one of the Datacenter/rack/zone A or B is lost.

• This has been discussed on the mailing list at
  http://lucene.472066.n3.nabble.com/SolrCloud-multiple-data-center-support-td4115097.html
  and there are many workarounds that require adding more moving parts to the system.

• On the above thread, Daniel Collins mentioned https://issues.apache.org/jira/browse/ZOOKEEPER-107
  which could help solve this issue.

• Note that this is a very important feature that is overlooked most of the time.

• Note that this feature is available in ElasticSearch.
  See http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/modules-cluster.html#allocation-awareness
  and
  http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/modules-cluster.html#forced-awareness

Issue Links

• is duplicated by: SOLR-8146 Allowing SolrJ CloudSolrClient to have preferred replica for query/read
• is part of: SOLR-6220 Replica placement strategy for solrcloud
• is related to: SOLR-6027 Replica assignments should try to take the host name into account so all replicas don't end up on the same host
• relates to: SOLR-6273 Cross Data Center Replication