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From "Mark Harwood (JIRA)" <>
Subject [jira] Commented: (LUCENE-1720) TimeLimitedIndexReader and associated utility class
Date Thu, 11 Feb 2010 23:02:29 GMT


Mark Harwood commented on LUCENE-1720:

bq. When's this ready to test with Solr?

I think the API is pretty stable - call try..start..finally...stop around time-critical stuff
and use a TimeLimitedIndexReader to wrap your IndexReader.

Internally the implementation feels reasonably stable too.

In my tests it doesn't seem to add too much overhead to calls -  I was getting response times
of 3400 milliseconds on a heavy wikipedia query with TimeLimitedIndexReader versus 3300 for
the same query on a raw IndexReader without timeout protection.

I'm tempted to try put the timeout check calls directly into a version of IndexReader rather
than in a delegating reader wrapper just to try see if the wrapper code is where the bulk
of the extra overhead comes in. I'd hate to add any overhead to core IndexReader but I'm keen
to see just how low-cost this check can get.

> TimeLimitedIndexReader and associated utility class
> ---------------------------------------------------
>                 Key: LUCENE-1720
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Index
>            Reporter: Mark Harwood
>            Assignee: Mark Harwood
>            Priority: Minor
>         Attachments:,,,, Lucene-1720.patch, LUCENE-1720.patch,,,,
> An alternative to TimeLimitedCollector that has the following advantages:
> 1) Any reader activity can be time-limited rather than just single searches e.g. the
document retrieve phase.
> 2) Times out faster (i.e. runaway queries such as fuzzies detected quickly before last
"collect" stage of query processing)
> Uses new utility timeout class that is independent of IndexReader.
> Initial contribution includes a performance test class but not had time as yet to work
up a formal Junit test.
> TimeLimitedIndexReader is coded as JDK1.5 but can easily be undone.

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