Tony Xu created LUCENE-8319:
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Summary: A Time-limiting collector that works with
CollectorManagers
Key: LUCENE-8319
URL: https://issues.apache.org/jira/browse/LUCENE-8319
Project: Lucene - Core
Issue Type: Improvement
Components: core/search
Reporter: Tony Xu
Currently Lucene has *TimeLimitingCollector* to support time-bound collection
and it will throw
*TimeExceededException* if timeout happens. This only works nicely with the
single-thread low-level API from the IndexSearcher. The method signature is --
*void search(List<LeafReaderContext> leaves, Weight weight, Collector
collector)*
The intended use is to always enclose the searcher.search(query, collector)
call with a try ... catch and handle the timeout exception. Unfortunately when
working with a *CollectorManager* in the multi-thread search context, the
*TimeExceededException* thrown during collecting one leaf slice will be
re-thrown by *IndexSearcher* without calling *CollectorManager*'s reduce(),
even if other slices are successfully collected. The signature
of the search api with *CollectorManager* is --
*<C extends Collector, T> T search(Query query, CollectorManager<C, T>
collectorManager)*
The good news is that IndexSearcher handles *CollectionTerminatedException*
gracefully by ignoring it. We can either wrap TimeLimitingCollector and throw
*CollectionTerminatedException* when timeout happens or simply replace
*TimeExceededException* with *CollectionTerminatedException*. In either way, we
also need to maintain a flag that indicates if timeout occurred so that the
user know it's a partial collection.
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