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https://issues.apache.org/jira/browse/SOLR-11127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16755022#comment-16755022
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Jan Høydahl commented on SOLR-11127:
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How to handle the two time gaps when .system will return 0 hits during copying?
Let's say we add a config option to configure {{BlobHandler}} and
{{UpdateRequestHandler}} into R/O mode (readOnly=true) where update requests
return HTTP 503 Service Unavailable. Then we could start by setting .system in
R/O and then safely copy back and forth and move alias only when copy is
complete, then at the end set .system back to readOnly=false and RELOAD .system
collection to get back to normal operation. Don't know how much work that would
be, sounds doable.
> Add a Collections API command to migrate the .system collection schema from
> Trie-based (pre-7.0) to Points-based (7.0+)
> -----------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-11127
> URL: https://issues.apache.org/jira/browse/SOLR-11127
> Project: Solr
> Issue Type: Task
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Steve Rowe
> Assignee: Andrzej Bialecki
> Priority: Blocker
> Labels: numeric-tries-to-points
> Fix For: 8.0
>
>
> SOLR-11119 will switch the Trie fieldtypes in the .system collection's schema
> to Points.
> Users with pre-7.0 .system collections will no longer be able to use them
> once Trie fields have been removed (8.0).
> Solr should provide a Collections API command MIGRATESYSTEMCOLLECTION to
> automatically convert a Trie-based .system collection to a Points-based one.
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