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From "Mark Harwood (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1720) TimeLimitedIndexReader and associated utility class
Date Mon, 29 Jun 2009 14:21:47 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12725197#action_12725197
] 

Mark Harwood commented on LUCENE-1720:
--------------------------------------

bq. any custom Scorer which does a lot of work, but uses IndexReader for that, will be stopped,
even if the Scorer's developer did not implement a Timeout mechanism. Right?

Correct. I'm not familiar with the proposal to pass around a Timeout object but I get the
idea and the code here would certainly avoid that overhead.

bq. We can cleat it when the time out threads' Set's size() is 0?

Yes, that would work.


> TimeLimitedIndexReader and associated utility class
> ---------------------------------------------------
>
>                 Key: LUCENE-1720
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1720
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Index
>            Reporter: Mark Harwood
>            Assignee: Mark Harwood
>            Priority: Minor
>         Attachments: ActivityTimedOutException.java, ActivityTimeMonitor.java, TestTimeLimitedIndexReader.java,
TimeLimitedIndexReader.java
>
>
> 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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