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https://issues.apache.org/jira/browse/SOLR-6399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16420139#comment-16420139
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Erick Erickson commented on SOLR-6399:
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I don't think this can be dealt with by backup/restore for the reasons Yago
outlines. Loading a collection might take a few minutes, whereas a
multi-terabyte index could take hours/days.
> Implement unloadCollection in the Collections API
> -------------------------------------------------
>
> Key: SOLR-6399
> URL: https://issues.apache.org/jira/browse/SOLR-6399
> Project: Solr
> Issue Type: New Feature
> Reporter: dfdeshom
> Assignee: Shalin Shekhar Mangar
> Priority: Major
> Fix For: 6.0
>
>
> There is currently no way to unload a collection without deleting its
> contents. There should be a way in the collections API to unload a collection
> and reload it later, as needed.
> A use case for this is the following: you store logs by day, with each day
> having its own collection. You are required to store up to 2 years of data,
> which adds up to 730 collections. Most of the time, you'll want to have 3
> days of data loaded for search. Having just 3 collections loaded into memory,
> instead of 730 will make managing Solr easier.
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