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https://issues.apache.org/jira/browse/SOLR-3397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13619222#comment-13619222
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Shawn Heisey commented on SOLR-3397:
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I was planning to file a feature request for something that the Gluster project
calls geo-replication. Would that fall under this issue, or should it be a new
one?
With this feature, you would have two semi-independent SolrCloud setups, one of
which would replicate from the other. Ideally, there would be no master or
slave - either the replication would work in both directions, or a higher-level
leader election would take place.
The driving force behind this feature is a user that wants to have a SolrCloud
setup that is fully redundant between two data centers and can remain
operational in the event of an entire data center going down. I'm not aware of
a way to build a zookeeper ensemble in two locations that can always guarantee
a working cluster without split-brain. Also, there is the fact that each
update must be sent to all shards/replicas at the same time, which can be
problematic when half of them are on a connection with high latency. If
synchronizing the two clouds happens on a longer interval than the indexing,
latency is less of a problem.
I'm sure there are a ton of technical challenges to this idea. Perhaps this is
a good candidate for GSoC?
> Insure that Replication and Solr Cloud are compatible
> -----------------------------------------------------
>
> Key: SOLR-3397
> URL: https://issues.apache.org/jira/browse/SOLR-3397
> Project: Solr
> Issue Type: Improvement
> Components: replication (java), SolrCloud
> Affects Versions: 4.0-ALPHA
> Reporter: Erick Erickson
>
> There has been at least one report of an early-adopter having replication (as
> in master/slave) configured with SolrCloud and having very odd results.
> Experienced Solr users could reasonably try this (or just have their
> configurations from 3.x Solr installations hanging around). Since SolrCloud
> takes this functionality over completely, it seems like replication needs to
> be made smart enough to disable itself if running under SolrCloud.
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