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https://issues.apache.org/jira/browse/LUCENE-8671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16762028#comment-16762028
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Ankit Jain commented on LUCENE-8671:
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I have added [^offheap_settings.patch] that allows user to pass list of offheap
field names through IndexWriterConfig. Interface looks clean enough from the
user and postings format perspective. There is some passing around of
offheapFieldNames parameter in lucene readers, but the changes are small and
internal to Lucene.
There is minor clean up that needs to be done, just want to get some feedback
before doing that.
> 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_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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