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https://issues.apache.org/jira/browse/LUCENE-9305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17074881#comment-17074881
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Mikhail Khludnev commented on LUCENE-9305:
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Hi, [~fedenkov]. I suppose it's a topic for mailing list, not for jira. It
seems like there's an ill query for a certain flexible query parser
configuration (you haven't shared a particular usage detail). I've looked
through code, it seems like CME might really happen in inaccurate node
linking&changing. I can say that threads shouldn't be a case, since query
parsing is single threaded most times. I can only advice to log that ill query
to find a reproducer for that particular configuration.
> Sometimes ConcurrentModificationException occurs in QueryNodeImpl.set
> ---------------------------------------------------------------------
>
> Key: LUCENE-9305
> URL: https://issues.apache.org/jira/browse/LUCENE-9305
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/queryparser
> Affects Versions: 7.6
> Environment: Happens both on Windows and Linux, any sort of hardware
> (we have about 30 installations in productions and it happens on each)
> Reporter: Ivan Fedenkov
> Priority: Major
>
> Hello.
> Sometimes a ConcurrentModificationException occures in my application with
> such a stacktrace:
> {noformat}
> java.util.ConcurrentModificationException: null
> at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909)
> at java.util.ArrayList$Itr.next(ArrayList.java:859)
> at
> org.apache.lucene.queryparser.flexible.core.nodes.QueryNodeImpl.set(QueryNodeImpl.java:104)
> at
> org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessorImpl.processChildren(QueryNodeProcessorImpl.java:137)
> at
> org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessorImpl.processIteration(QueryNodeProcessorImpl.java:96)
> at
> org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessorImpl.processChildren(QueryNodeProcessorImpl.java:124)
> at
> org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessorImpl.processIteration(QueryNodeProcessorImpl.java:96)
> at
> org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessorImpl.processChildren(QueryNodeProcessorImpl.java:124)
> at
> org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessorImpl.processIteration(QueryNodeProcessorImpl.java:96)
> at
> org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessorImpl.processChildren(QueryNodeProcessorImpl.java:124)
> at
> org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessorImpl.processIteration(QueryNodeProcessorImpl.java:96)
> at
> org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessorImpl.processChildren(QueryNodeProcessorImpl.java:124)
> at
> org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessorImpl.processIteration(QueryNodeProcessorImpl.java:96)
> at
> org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessorImpl.process(QueryNodeProcessorImpl.java:89)
> at
> org.apache.lucene.queryparser.flexible.core.processors.QueryNodeProcessorPipeline.process(QueryNodeProcessorPipeline.java:89)
> at
> org.apache.lucene.queryparser.flexible.core.QueryParserHelper.parse(QueryParserHelper.java:250)
> at
> org.apache.lucene.queryparser.flexible.standard.StandardQueryParser.parse(StandardQueryParser.java:158)
> {noformat}
> It happens very rare, I would say in 0.01% of all query parsing.
> I tried to reproduce it with concurrent tests, by have no success.
> My Lucene version is 7.6.0
> QueryNodeImpl.set(QueryNodeImpl.java:104) looks like this on my version
> {noformat}
> // reset parent value
> for (QueryNode child : children) {
> child.removeFromParent();
> }
> {noformat}
> Could I get any help, please?
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