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https://issues.apache.org/jira/browse/LUCENE-4538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13490627#comment-13490627
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Robert Muir commented on LUCENE-4538:
-------------------------------------
I haven't looked in detail (will try to do a real review later) but I think
something like this is really needed.
Its currently absurd: we make it easy as pie to load up enormous data
structures in RAM but nearly impossible to use stuff from disk.
It should be the other way around.
{quote}
We can certainly reduce the overhead (maybe different issue)
{quote}
We should do this too!
> Cache DocValues DirecSource
> ----------------------------
>
> Key: LUCENE-4538
> URL: https://issues.apache.org/jira/browse/LUCENE-4538
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/codecs
> Affects Versions: 4.0
> Reporter: Simon Willnauer
> Fix For: 4.1, 5.0
>
> Attachments: LUCENE-4538.patch
>
>
> Currently the user need to make sure that a direct source is not shared
> between threads and each time someone calls getDirectSource we create a new
> source which has a reasonable overhead. We can certainly reduce the overhead
> (maybe different issue) but it should be easier for the user to get a direct
> source and handle it. More than that is should be consistent with getSource /
> loadSource.
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