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https://issues.apache.org/jira/browse/SOLR-7095?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16712868#comment-16712868
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Cassandra Targett commented on SOLR-7095:
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It feels to me like this has been implemented with CDCR, especially now that it
supports bidirectional updates?
> Disaster Recovery native online cross-site replication for NRT SolrCloud
> ------------------------------------------------------------------------
>
> Key: SOLR-7095
> URL: https://issues.apache.org/jira/browse/SOLR-7095
> Project: Solr
> Issue Type: New Feature
> Affects Versions: 4.10
> Reporter: Hari Sekhon
> Priority: Major
>
> Feature request to add native online cross-site DR support for NRT SolrCloud.
> Currently NRT DR recovery requires taking down the recovering cluster
> including halting any new indexing, changing zookeeper emsembles to the other
> datacenter for one node per shard to replicate, then taking down again to
> switch back to local DC zookeeper ensemble after shard has caught up. This is
> a relatively difficult/tedious manual operation to perform and seems
> impossible to get completely up to date in scenarios with constant new update
> requests arriving during downtime of switching back to local DC's zookeeper
> ensemble, therefore preventing 100% accurate catch up.
> There will be trade-offs such as making cross-site replication async to avoid
> update latency penalty, and may require a last-write-wins type scenario like
> Cassandra.
> Regards,
> Hari Sekhon
> http://www.linkedin.com/in/harisekhon
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