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https://issues.apache.org/jira/browse/LUCENE-5703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14018656#comment-14018656
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Adrien Grand commented on LUCENE-5703:
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{quote}
* System.arraycopy
* big fat warnings on these that they are "unsafe" (they are not part of the
official index format, so maybe thats ok).
* they could keep ahold of their file descriptors and override merge() to
stream the data from the file.
{quote}
I'm hesitating between the 1st and 2nd idea. I'm not a fan of the 3rd idea as
it would make merging a bit more complex although I really like how simple it
is today.
Since the default codec doesn't have the issue and since this issue already
exists in other index formats (eg. the payload of DirectPostingsFormat), I
think it would be fine to just have a warning?
> Don't allocate/copy bytes all the time in binary DV producers
> -------------------------------------------------------------
>
> Key: LUCENE-5703
> URL: https://issues.apache.org/jira/browse/LUCENE-5703
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Fix For: 4.9, 5.0
>
> Attachments: LUCENE-5703.patch, LUCENE-5703.patch, LUCENE-5703.patch,
> LUCENE-5703.patch, LUCENE-5703.patch, LUCENE-5703.patch, LUCENE-5703.patch
>
>
> Our binary doc values producers keep on creating new {{byte[]}} arrays and
> copying bytes when a value is requested, which likely doesn't help
> performance. This has been done because of the way fieldcache consumers used
> the API, but we should try to fix it in 5.0.
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