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https://issues.apache.org/jira/browse/LUCENE-5761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14181063#comment-14181063
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Per Steffensen commented on LUCENE-5761:
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Ok, thanks, we will try that when upgrading to a version that does not support
"Disk" doc-values anymore.
I just imagined that the non-"Disk" doc-values required all the data in memory
while working with it (just as FieldCache does). E.g. that it memory mapped the
entire doc-values file. But I really do not know anything about how it works.
We will try the non-"Disk" doc-values when we get that far.
Thanks again!
> Remove DiskDocValuesFormat
> --------------------------
>
> Key: LUCENE-5761
> URL: https://issues.apache.org/jira/browse/LUCENE-5761
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Fix For: 4.9, Trunk
>
> Attachments: LUCENE-5761.patch
>
>
> I see users using this, i think they are unaware of the horrible tradeoffs it
> makes.
> We don't e.g. have codecs that have the term dictionary entirely on disk or
> other stupid things in lucene, so we shouldnt be stupid here either.
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