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https://issues.apache.org/jira/browse/SOLR-13405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16818312#comment-16818312
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Yonik Seeley commented on SOLR-13405:
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0 replica support thoughts:
The idea of bringing up another replica if 1 replica seems down can naturally
be extended to include 0 replica support. The idea can be recast as requesting
a new replica on demand if all existing replicas (including 0) seem down to a
client. One area where this is a little different is the indexing side...
there would need to be code in the indexing paths that recognize 0 replicas
configured and bring one up on demand. After a certain period of inactivity,
we'd want to return to 0 replicas. This could probably be split off into a
different JIRA.
> Support 1 or 0 replicas per shard
> ---------------------------------
>
> Key: SOLR-13405
> URL: https://issues.apache.org/jira/browse/SOLR-13405
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Yonik Seeley
> Priority: Major
>
> When multiple replicas per shard are not needed for data durability (because
> of shared storage support on HDFS or S3, etc), other cluster configurations
> suddenly make sense like allowing 1 or even 0 replicas per shard (primarily
> to lower costs.)
> One big issue with a single replica per shard is that zookeeper (and thus the
> overseer) waits for a session timeout before marking the node as down.
> Instead of queries having to wait this long (~30 sec), if a SolrJ query
> client detects that a node died, it can ask the overseer to quickly bring up
> another replica.
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