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Fix concurrency bug in DrillSidewaysQuery (#195)

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Greg Miller 2021-06-24 12:18:38 -07:00 committed by GitHub
parent 9942d59f0d
commit 578f5cf51b
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1 changed files with 6 additions and 2 deletions
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8
lucene/facet/src/java/org/apache/lucene/facet/DrillSidewaysQuery.java
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@ -19,6 +19,7 @@ package org.apache.lucene.facet;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Objects;
@ -65,12 +66,15 @@ class DrillSidewaysQuery extends Query {
FacetsCollectorManager[] drillSidewaysCollectorManagers,
Query[] drillDownQueries,
boolean scoreSubDocsAtOnce) {
// Note that the "managed" facet collector lists are synchronized here since bulkScorer()
// can be invoked concurrently and needs to remain thread-safe. We're OK with synchronizing
// on the whole list as contention is expected to remain very low:
this(
baseQuery,
drillDownCollectorManager,
drillSidewaysCollectorManagers,
new ArrayList<>(),
new ArrayList<>(),
Collections.synchronizedList(new ArrayList<>()),
Collections.synchronizedList(new ArrayList<>()),
drillDownQueries,
scoreSubDocsAtOnce);
}