Tommaso Teofili created LUCENE-6435:
---------------------------------------
Summary: java.util.ConcurrentModificationException: Removal from
the cache failed error in SimpleNaiveBayesClassifier
Key: LUCENE-6435
URL: https://issues.apache.org/jira/browse/LUCENE-6435
Project: Lucene - Core
Issue Type: Bug
Components: modules/classification
Affects Versions: 5.1
Reporter: Tommaso Teofili
Assignee: Tommaso Teofili
Fix For: Trunk
While using {{SimpleNaiveBayesClassifier}} on a very large index (all Italian
Wikipedia articles) I see the following code triggering a
{{ConcurrentModificationException}} when evicting the {{Query}} from the
{{LRUCache}}.
{code}
BooleanQuery booleanQuery = new BooleanQuery();
BooleanQuery subQuery = new BooleanQuery();
for (String textFieldName : textFieldNames) {
subQuery.add(new BooleanClause(new TermQuery(new Term(textFieldName,
word)), BooleanClause.Occur.SHOULD));
}
booleanQuery.add(new BooleanClause(subQuery, BooleanClause.Occur.MUST));
booleanQuery.add(new BooleanClause(new TermQuery(new Term(classFieldName,
c)), BooleanClause.Occur.MUST));
//...
TotalHitCountCollector totalHitCountCollector = new
TotalHitCountCollector();
indexSearcher.search(booleanQuery, totalHitCountCollector);
return totalHitCountCollector.getTotalHits();
{code}
this is the complete stacktrace:
{noformat}
java.util.ConcurrentModificationException: Removal from the cache failed! This
is probably due to a query which has been modified after having been put into
the cache or a badly implemented clone(). Query class: [class
org.apache.lucene.search.BooleanQuery], query: [#text:panoram #cat:1356]
{noformat}
The strange thing is that the above doesn't happen if I change the last lines
of the above piece of code to not use the {{TotalHitCountsCollector}}:
{code}
return indexSearcher.search(booleanQuery, 1).totalHits;
{code}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
