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https://issues.apache.org/jira/browse/LUCENE-8671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16772068#comment-16772068
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Michael McCandless commented on LUCENE-8671:
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Actually I think this is a good use case for the existing attributes in
{{FieldInfo}} – this sort of extensibility is exactly why we have attributes.
But can you use the existing {{attributes}} instead of adding a new
{{readerAttributes}}? And could we make this something a custom {{Codec}} impl
would set? Then we shouldn't need any changes to {{FieldInfo.java}},
{{IndexWriter.java}}, {{LiveIndexWriterConfig.java}}, etc. We'd just make a
custom codec setting this attribute for fields where we want to override
Lucene's ({{BlockTreeTermReader}}'s) default behavior. Yes, it'd mean one must
commit at indexing time as to which fields will be on vs off heap at search
time, but I think that's an OK tradeoff?
> Add setting for moving FST offheap/onheap
> -----------------------------------------
>
> Key: LUCENE-8671
> URL: https://issues.apache.org/jira/browse/LUCENE-8671
> Project: Lucene - Core
> Issue Type: New Feature
> Components: core/FSTs, core/store
> Reporter: Ankit Jain
> Priority: Minor
> Attachments: offheap_generic_settings.patch, offheap_settings.patch
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> While LUCENE-8635, adds support for loading FST offheap using mmap, users do
> not have the flexibility to specify fields for which FST needs to be
> offheap. This allows users to tune heap usage as per their workload.
> Ideal way will be to add an attribute to FieldInfo, where we have
> put/getAttribute. Then FieldReader can inspect the FieldInfo and pass the
> appropriate On/OffHeapStore when creating its FST. It can support special
> keywords like ALL/NONE.
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