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Posted to dev@lucene.apache.org by "Yonik Seeley (JIRA)" <ji...@apache.org> on 2019/04/15 16:33:00 UTC

[jira] [Created] (SOLR-13405) Support 1 or 0 replicas per shard

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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