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https://issues.apache.org/jira/browse/LUCENE-8671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16772384#comment-16772384
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Ankit Jain commented on LUCENE-8671:
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bq. 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?
I like this idea, just did not want it to be indexing time decision. Given
performance implications are not significant and we were discussing making
offheap as default earlier, most users eventually will have it on during
indexing also.
> 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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