Chris M. Hostetter created SOLR-15429:
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Summary: Solr implications of LUCENE-8811 changes to how
(solr.xml's) maxBooleanClauses is now used by IndexSearcher
Key: SOLR-15429
URL: https://issues.apache.org/jira/browse/SOLR-15429
Project: Solr
Issue Type: Task
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Chris M. Hostetter
{panel:title=Background Info}
LUCENE-8811 Modified Lucene 9.x to expanded the usage of
{{BooleanQuery.maxClauseCount}} (now moved to {{IndexSearcher.maxClauseCount}})
Now, in addition to being a limit on the number of individual clauses that can
be specified when creating _single_ BooleanQuery (either explicitly or during
{{Query.rewrite()}}) it is also used by a {{QueryVisitor}} (after
{{Query.rewrite()}} to enforce a limit on the total number of clauses in a
_nested_ query structure.
In other words, the following psuedo code will work in lucene 8, but fail in
lucene 9...
{code:java}
x = new BooleanQuery()
y = new BooleanQuery()
for (int i = 0; i < BooleanQuery.maxClauseCount - 1; i++) {
x.addClause(new TermQuery("fx:" + i))
y.addClause(new TermQuery("fy:" + i))
}
BooleanQuery wrapper = new BooleanQuery(x, y)
searcher.search(wrapper)
{code}
{panel}
{panel:title=(Current) Impacts on Solr users}
The solr.xml {{maxBooleanClauses}} setting is what currently controls how this
value is configured. If unset, it defaults to the lucene default (unchanged in
9.x) of 1024 – but the solr.xml files shipped with all versions of Solr since
8.1 have specified a value of {{"\${solr.max.booleanClauses:1024}"}} (see
SOLR-13336)
The direct impacts of LUCENE-8811 on Solr users (as of the current
solr.git/main branch) is that queries which worked fine in 8.x may start
throwing {{TooManyClauses()}} exceptions in 9.x, even with existing (built by
8.x) indexes, depending on how complex and deeply nested the query structures
are.
{panel}
This jira is being created as a focal point for assess/discussion what changes
we want to make to Solr code and/or documentation regarding
{{maxBooleanClauses}} in Solr 9.0.
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