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https://issues.apache.org/jira/browse/LUCENE-9969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17414308#comment-17414308
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Haoyu Zhai commented on LUCENE-9969:
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[~gsmiller] thanks for mentioning that, it's surprised that we're currently
using term positions to store the parents ordinal. Do you know whether we have
a specific reason for doing this? Or it's just because when the code was
created we don't have NumericDocValues? I think we should create a separate
issue switching to use NDV if there's no specific reason against that since it
will should be faster and (probably) better compressed?
> 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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