[jira] Resolved: (LUCENE-1125) Excessive Arrays.fill(0) in DocumentsWriter drastically slows down small docs (3.9X slowdown!)

["Michael McCandless (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-1125?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless resolved LUCENE-1125.
----------------------------------------

    Resolution: Fixed

Fixed on trunk & 2.3 branch.

> Excessive Arrays.fill(0) in DocumentsWriter drastically slows down small docs (3.9X slowdown!)
> ----------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-1125
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1125
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 2.3
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 2.3
>
>         Attachments: LUCENE-1125.patch
>
>
> I've been doing some "final" performance testing of 2.3RC1 and
> uncovered a fairly serious bug that adds a large fixed CPU cost when
> documents have any term vector enabled fields.
> The bug does not affect correctness, just performance.
> Basically, for every document, we were calling Arrays.fill(0) on a
> large (32 KB) byte array when in fact we only needed to zero a small
> part of it.  This only happens if term vectors are turned on, and is
> especially devastating for small documents.

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