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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-5703) Don't allocate/copy bytes all the time in binary DV producers
Date Thu, 05 Jun 2014 10:36:01 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-5703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14018656#comment-14018656
] 

Adrien Grand commented on LUCENE-5703:
--------------------------------------

{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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