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https://issues.apache.org/jira/browse/LUCENE-10565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17536357#comment-17536357
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Greg Miller commented on LUCENE-10565:
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A tricky aspect of this is identifying which fields to pre-build the ordinal
maps for, but I wonder if we could leverage {{FacetsConfig}} for this.
Unfortunately, users don't have to register a facet field with {{FacetsConfig}}
if they want all the default behavior, but maybe there's something we could do
with this to make it more straight-forward to identify all the SSDV fields
being used for faceting on reopen so the ordinal maps could be built.
> Can we "warm" SSDV ordinal maps on index reopen?
> ------------------------------------------------
>
> Key: LUCENE-10565
> URL: https://issues.apache.org/jira/browse/LUCENE-10565
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Reporter: Greg Miller
> Priority: Major
>
> As [~rcmuir] and [~jpountz] pointed out in a [discussion about facet
> benchmarks|https://github.com/mikemccand/luceneutil/issues/169], we lazily
> build ordinal maps needed for SSDV faceting the first time we need them for a
> given index field instead of eagerly building them when the index is
> reopened. This puts an expensive penalty on the search path whenever an index
> is reloaded. Let's see if we can eagerly build these maps as part of
> reopening the index so the user doesn't get hit with this at search time.
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