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https://issues.apache.org/jira/browse/LUCENE-8783?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ankit Jain updated LUCENE-8783:
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Review Patch?: (was: Yes)
> Support FST lazy loading for non-default Codecs
> -----------------------------------------------
>
> Key: LUCENE-8783
> URL: https://issues.apache.org/jira/browse/LUCENE-8783
> Project: Lucene - Core
> Issue Type: New Feature
> Components: core/FSTs
> Reporter: Ankit Jain
> Priority: Major
> Fix For: 8.0, 8.x, master (9.0)
>
>
> Currently, FST loads all the terms into heap memory during index open. This
> causes frequent JVM OOM issues if the term size gets big. A better way of
> doing this will be to lazily load FST using mmap. That ensures only the
> required terms get loaded into memory.
>
> Lucene can expose API for providing list of fields to load terms offheap. I'm
> planning to take following approach for this:
> # Add a boolean property fstOffHeap in FieldInfo
> # Pass list of offheap fields to lucene during index open (ALL can be
> special keyword for loading ALL fields offheap)
> # Initialize the fstOffHeap property during lucene index open
> # FieldReader invokes default FST constructor or OffHeap constructor based
> on fstOffHeap field
>
> I created a patch (that loads all fields offheap), did some benchmarks using
> es_rally and results look good.
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