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noble pushed a commit to branch jira/solr16165
in repository https://gitbox.apache.org/repos/asf/solr.git

commit 53ef72c1bebed97e249517aeab931ae87e0d01da
Author: Noble Paul <[email protected]>
AuthorDate: Mon Apr 25 22:32:16 2022 +1000

    SOLR-16165: Rare deadlock in SlotAcc initialization
---
 .../org/apache/solr/search/facet/Constants.java    | 23 ++++++
 .../search/facet/FacetFieldProcessorByArray.java   |  2 +-
 .../java/org/apache/solr/search/facet/SlotAcc.java | 89 +++++++++++-----------
 3 files changed, 70 insertions(+), 44 deletions(-)

diff --git a/solr/core/src/java/org/apache/solr/search/facet/Constants.java 
b/solr/core/src/java/org/apache/solr/search/facet/Constants.java
new file mode 100644
index 00000000000..3842415c65a
--- /dev/null
+++ b/solr/core/src/java/org/apache/solr/search/facet/Constants.java
@@ -0,0 +1,23 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.solr.search.facet;
+
+public class Constants {
+  public static final SlotAcc.DevNullCountSlotAcc DEV_NULL_SLOT_ACC = new 
SlotAcc.DevNullCountSlotAcc();
+  private Constants() { }
+}
diff --git 
a/solr/core/src/java/org/apache/solr/search/facet/FacetFieldProcessorByArray.java
 
b/solr/core/src/java/org/apache/solr/search/facet/FacetFieldProcessorByArray.java
index c52a05a939f..38681bf2070 100644
--- 
a/solr/core/src/java/org/apache/solr/search/facet/FacetFieldProcessorByArray.java
+++ 
b/solr/core/src/java/org/apache/solr/search/facet/FacetFieldProcessorByArray.java
@@ -121,7 +121,7 @@ abstract class FacetFieldProcessorByArray extends 
FacetFieldProcessor {
         // AIOOBE
         // NOTE: because collectAcc will be null, it is fine/irrelevant to set 
a countAcc that
         // doesn't support sweeping
-        countAcc = SlotAcc.DEV_NULL_SLOT_ACC;
+        countAcc = Constants.DEV_NULL_SLOT_ACC;
         createAccs(nDocs, 1);
         assert collectAcc == null;
         // accs is created above and set on allBucketsAcc; but during 
collection, setNextReader is
diff --git a/solr/core/src/java/org/apache/solr/search/facet/SlotAcc.java 
b/solr/core/src/java/org/apache/solr/search/facet/SlotAcc.java
index 753eeb174ec..05ef90cfb6d 100644
--- a/solr/core/src/java/org/apache/solr/search/facet/SlotAcc.java
+++ b/solr/core/src/java/org/apache/solr/search/facet/SlotAcc.java
@@ -844,61 +844,64 @@ public abstract class SlotAcc implements Closeable {
    * This CountSlotAcc exists as a /dev/null sink for callers of collect(...) 
and other "write"-type
    * methods. It should be used in contexts where "read"-type access methods 
will never be called.
    */
-  static final CountSlotAcc DEV_NULL_SLOT_ACC =
-      new CountSlotAcc(null) {
+  static class DevNullCountSlotAcc extends CountSlotAcc {
 
-        @Override
-        public void resize(Resizer resizer) {
-          // No-op
-        }
+    public DevNullCountSlotAcc() {
+      super(null);
+    }
 
-        @Override
-        public void reset() throws IOException {
-          // No-op
-        }
+    @Override
+    public void resize(Resizer resizer) {
+      // No-op
+    }
 
-        @Override
-        public void collect(int doc, int slot, IntFunction<SlotContext> 
slotContext)
+    @Override
+    public void reset() throws IOException {
+      // No-op
+    }
+
+    @Override
+    public void collect(int doc, int slot, IntFunction<SlotContext> 
slotContext)
             throws IOException {
-          // No-op
-        }
+      // No-op
+    }
 
-        @Override
-        public void incrementCount(int slot, long count) {
-          // No-op
-        }
+    @Override
+    public void incrementCount(int slot, long count) {
+      // No-op
+    }
 
-        @Override
-        public void setNextReader(LeafReaderContext readerContext) throws 
IOException {
-          // No-op
-        }
+    @Override
+    public void setNextReader(LeafReaderContext readerContext) throws 
IOException {
+      // No-op
+    }
 
-        @Override
-        public int collect(DocSet docs, int slot, IntFunction<SlotContext> 
slotContext)
+    @Override
+    public int collect(DocSet docs, int slot, IntFunction<SlotContext> 
slotContext)
             throws IOException {
-          return docs.size(); // dressed up no-op
-        }
+      return docs.size(); // dressed up no-op
+    }
 
-        @Override
-        public Object getValue(int slotNum) throws IOException {
-          throw new UnsupportedOperationException("not supported");
-        }
+    @Override
+    public Object getValue(int slotNum) throws IOException {
+      throw new UnsupportedOperationException("not supported");
+    }
 
-        @Override
-        public int compare(int slotA, int slotB) {
-          throw new UnsupportedOperationException("not supported");
-        }
+    @Override
+    public int compare(int slotA, int slotB) {
+      throw new UnsupportedOperationException("not supported");
+    }
 
-        @Override
-        public void setValues(SimpleOrderedMap<Object> bucket, int slotNum) 
throws IOException {
-          throw new UnsupportedOperationException("not supported");
-        }
+    @Override
+    public void setValues(SimpleOrderedMap<Object> bucket, int slotNum) throws 
IOException {
+      throw new UnsupportedOperationException("not supported");
+    }
 
-        @Override
-        public long getCount(int slot) {
-          throw new UnsupportedOperationException("not supported");
-        }
-      };
+    @Override
+    public long getCount(int slot) {
+      throw new UnsupportedOperationException("not supported");
+    }
+  };
 
   static class CountSlotArrAcc extends CountSlotAcc {
     long[] result;

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