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https://issues.apache.org/jira/browse/LUCENE-9969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17419185#comment-17419185
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Greg Miller commented on LUCENE-9969:
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[~zhai7631] I don't think there's any good reason for doing this other than
historical/legacy. It looks like that
[code|https://github.com/apache/lucene/blob/main/lucene/facet/src/java/org/apache/lucene/facet/taxonomy/directory/TaxonomyIndexArrays.java#L127]
dates back to 2012, and I suspect index format options were quite different
then.
+1 to experimenting with {{NumericDocValues}} for this purpose, especially
since they should be dense, with no need to encode the docs-with-values, etc.
Want to spin off a separate issue to explore this?
> DirectoryTaxonomyReader.taxoArray占用内存较大导致系统OOM宕机
> ------------------------------------------------
>
> Key: LUCENE-9969
> URL: https://issues.apache.org/jira/browse/LUCENE-9969
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Affects Versions: 6.6.2
> Reporter: FengFeng Cheng
> Priority: Trivial
> Attachments: image-2021-05-24-13-43-43-289.png
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> 首先数据量很大，jvm内存为90G，但是TaxonomyIndexArrays几乎占走了一半
> !image-2021-05-24-13-43-43-289.png!
> 请问对于TaxonomyReader是否有更好的使用方式或者其他的优化？
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