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From "Greg Tarr (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1720) TimeLimitedIndexReader and associated utility class
Date Mon, 17 May 2010 14:58:42 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12868246#action_12868246
] 

Greg Tarr commented on LUCENE-1720:
-----------------------------------

We're using lucene in a large distributed search environment and we would hugely benefit from
this patch being available in the main Lucene build. We were formerly using timeouts as part
of our search broker, but it would make much more sense for these timeouts to operate at the
IndexReader level so that we can prevent hanging threads.

> 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, ActivityTimeMonitor.java,
ActivityTimeMonitor.java, LUCENE-1720.patch, LUCENE-1720.patch, Lucene-1720.patch, Lucene-1720.patch,
LUCENE-1720.patch, TestTimeLimitedIndexReader.java, TestTimeLimitedIndexReader.java, TimeLimitedIndexReader.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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