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https://issues.apache.org/jira/browse/LUCENE-10054?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17430199#comment-17430199
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Mayya Sharipova commented on LUCENE-10054:
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[~mikemccand] Thanks for checking. This issue is not resolved yet.
We have implemented this as a [feature
brach|https://github.com/apache/lucene/tree/hnsw], but it has not been merged
to the `main` branch yet. Storing hierarchy on disk is already implemented in
that feature branch as well.
We had an idea to move some data off-heap, and run more benchmarking tests, and
then open a PR against a `main` branch.
> Handle hierarchy in HNSW graph
> ------------------------------
>
> Key: LUCENE-10054
> URL: https://issues.apache.org/jira/browse/LUCENE-10054
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Mayya Sharipova
> Priority: Major
> Time Spent: 8.5h
> Remaining Estimate: 0h
>
> Currently HNSW graph is represented as a single layer graph.
> We would like to extend it to handle hierarchy as per
> [discussion|https://issues.apache.org/jira/browse/LUCENE-9004?focusedCommentId=17393216&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-17393216].
>
>
> TODO tasks:
> - add multiple layers in the HnswGraph class
> - modify the format in Lucene90HnswVectorsWriter and
> Lucene90HnswVectorsReader to handle multiple layers
> - modify graph construction and search algorithm to handle hierarchy
> - run benchmarks
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