Yonik Seeley created SOLR-13405:
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Summary: 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
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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