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https://issues.apache.org/jira/browse/LUCENE-9148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17097370#comment-17097370
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Adrien Grand commented on LUCENE-9148:
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Something else that is a bit annoying is that opening a reader does
O(numFields) seeks because of this organization of the file. So I started
working on splitting it into multiple files.
> Move the BKD index to its own file.
> -----------------------------------
>
> Key: LUCENE-9148
> URL: https://issues.apache.org/jira/browse/LUCENE-9148
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Adrien Grand
> Priority: Minor
>
> Lucene60PointsWriter stores both inner nodes and leaf nodes in the same file,
> interleaved. For instance if you have two fields, you would have
> {{<leaf_nodes_A, inner_nodes_A, leaf_nodes_B, inner_nodes_B>}}. It's not
> ideal since leaves and inner nodes have quite different access patterns.
> Should we split this into two files? In the case when the BKD index is
> off-heap, this would also help force it into RAM with
> {{MMapDirectory#setPreload}}.
> Note that Lucene60PointsFormat already has a file that it calls "index" but
> it's really only about mapping fields to file pointers in the other file and
> not what I'm discussing here. But we could possibly store the BKD indices in
> this existing file if we want to avoid creating a new one.
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