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https://issues.apache.org/jira/browse/LUCENE-6842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14963276#comment-14963276
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Dawid Weiss commented on LUCENE-6842:
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> But I can share the generic information about how many fields and how we got
> into that place.
Ok. I don't think many people have a million fields to index... A few dozen,
perhaps a few hundred... but millions sounds odd.
> No way to limit the fields cached in memory and leads to OOM when there are
> thousand of fields (thousands)
> ----------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-6842
> URL: https://issues.apache.org/jira/browse/LUCENE-6842
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/search
> Affects Versions: 4.6.1
> Environment: Linux, openjdk 1.6.x
> Reporter: Bala Kolla
> Attachments: HistogramOfHeapUsage.png
>
>
> I am opening this defect to get some guidance on how to handle a case of
> server running out of memory and it seems like it's something to do how we
> index. But want to know if there is anyway to reduce the impact of this on
> memory usage before we look into the way of reducing the number of fields.
> Basically we have many thousands of fields being indexed and it's causing a
> large amount of memory being used (25GB) and eventually leading to
> application to hang and force us to restart every few minutes.
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