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https://issues.apache.org/jira/browse/LUCENE-9955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17343337#comment-17343337
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Adrien Grand commented on LUCENE-9955:
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I put up a PR at https://github.com/apache/lucene/pull/137.

> Remove state from stored fields readers
> ---------------------------------------
>
>                 Key: LUCENE-9955
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9955
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Because stored fields readers are cached per-segment per-thread, they can 
> quickly start using lots of memory. E.g. an innocent 10kB buffer with 10 
> Lucene indices that have 100 segments each and are queried by 100 threads 
> would eventually end up using 1GB of heap.



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