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https://issues.apache.org/jira/browse/LUCENE-8671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16818361#comment-16818361
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ASF subversion and git services commented on LUCENE-8671:
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Commit 651f41e21bd3df98f70d2673295db29506e3d2e6 in lucene-solr's branch
refs/heads/branch_8x from Simon Willnauer
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=651f41e ]
LUCENE-8671: Introduce Reader attributes (#640)
Reader attributes allows a per IndexReader configuration of codec internals.
For instance this allows a per reader configuration if FSTs are loaded into
memory or are left
on disk.
> 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
> Assignee: Simon Willnauer
> Priority: Minor
> Fix For: 8.1, master (9.0)
>
> Attachments: offheap_generic_settings.patch, offheap_settings.patch
>
> Original Estimate: 24h
> Time Spent: 5h
> Remaining Estimate: 19h
>
> 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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