Chris M. Hostetter created LUCENE-10292:
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Summary: AnalyzingInfixSuggester thread safety: lookup() fails
during (re)build()
Key: LUCENE-10292
URL: https://issues.apache.org/jira/browse/LUCENE-10292
Project: Lucene - Core
Issue Type: Bug
Reporter: Chris M. Hostetter
I'm filing this based on anecdotal information from a Solr user w/o
experiencing it first hand (and I don't have a test case to demonstrate it) but
based on a reading of the code the underlying problem seems self evident...
With all other Lookup implementations I've examined, it is possible to call
{{lookup()}} regardless of whether another thread is concurrently calling
{{build()}} – in all cases I've seen, it is even possible to call {{lookup()}}
even if {{build()}} has never been called: the result is just an "empty"
{{List<LookupResult>}}
Typically this is works because the {{build()}} method uses temporary
datastructures until it's "build logic" is complete, at which point it
atomically replaces the datastructures used by the {{lookup()}} method. In
the case of {{AnalyzingInfixSuggester}} however, the {{build()}} method starts
by closing & null'ing out the {{protected SearcherManager searcherMgr}} (which
it only populates again once it's completed building up it's index) and then
the lookup method starts with...
{code:java}
if (searcherMgr == null) {
throw new IllegalStateException("suggester was not built");
}
{code}
... meaning it is unsafe to call {{AnalyzingInfixSuggester.lookup()}} in any
situation where another thread may be calling
{{AnalyzingInfixSuggester.build()}}
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