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Posted to issues@solr.apache.org by "Cassandra Targett (Jira)" <ji...@apache.org> on 2021/08/17 13:32:00 UTC
[jira] [Commented] (SOLR-15588) Implement random replica placement
strategy
[ https://issues.apache.org/jira/browse/SOLR-15588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17400394#comment-17400394 ]
Cassandra Targett commented on SOLR-15588:
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A RandomPlacementFactory already exists for 9.0, as one of the 3 OOTB replica placement options that will be available: https://nightlies.apache.org/solr/draft-guides/solr-reference-guide-main/replica-placement-plugins.html.
I think it might be complex to add to 8.x - just based on what I know of what a mess 8.x is in this regard - and both of the placement approaches available in 8.x are removed in 9.0 so it would also be throw-away work. But it sounds like you have something working already? I could see an argument that it might be helpful for people who need to stay on 8.x for a while, as a stopgap between the current situation in 8.x and the replacement in 9.0. But IMO it should be thought of and explicitly documented as a stopgap.
> Implement random replica placement strategy
> -------------------------------------------
>
> Key: SOLR-15588
> URL: https://issues.apache.org/jira/browse/SOLR-15588
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Affects Versions: main (9.0), 8x
> Reporter: Megan Carey
> Priority: Minor
>
> While this might be particularly interesting to users of 8x, it can also be made available in 9+: a replica placement strategy that randomly selects a node in the cluster (as long as no other replicas of that shard already live on that node).
> This has proven to be a valuable strategy for my use case, as it allows for really fast replica placement (-> fast collection creation, fast rebalancing, etc.), but it does not explicitly respect Autoscaling policies, so should be used wisely.
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