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From "Robert Muir (JIRA)" <>
Subject [jira] Commented: (LUCENE-2829) improve termquery "pk lookup" performance
Date Tue, 21 Dec 2010 20:48:04 GMT


Robert Muir commented on LUCENE-2829:

right, we just have to not do stupid things like hash hashcodes to make it faster for when
the data is hot...
but as a start this is safe, hopefully we could do something non-invasive (and backportable)
to make it faster.

> improve termquery "pk lookup" performance
> -----------------------------------------
>                 Key: LUCENE-2829
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Robert Muir
>         Attachments: LUCENE-2829.patch
> For things that are like primary keys and don't exist in some segments (worst case is
primary/unique key that only exists in 1)
> we do wasted seeks.
> While LUCENE-2694 tries to solve some of this issue with TermState, I'm concerned we
could every backport that to 3.1 for example.
> This is a simpler solution here just to solve this one problem in termquery... we could
just revert it in trunk when we resolve LUCENE-2694,
> but I don't think we should leave things as they are in 3.x

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