gautamworah96 commented on a change in pull request #179:
URL: https://github.com/apache/lucene/pull/179#discussion_r696168048



##########
File path: 
lucene/facet/src/java/org/apache/lucene/facet/taxonomy/directory/DirectoryTaxonomyReader.java
##########
@@ -351,12 +349,139 @@ public FacetLabel getPath(int ordinal) throws 
IOException {
     }
 
     synchronized (categoryCache) {
-      categoryCache.put(catIDInteger, ret);
+      categoryCache.put(ordinal, ret);
     }
 
     return ret;
   }
 
+  private FacetLabel getPathFromCache(int ordinal) {
+    // TODO: can we use an int-based hash impl, such as IntToObjectMap,
+    // wrapped as LRU?

Review comment:
       Created 
[LUCENE-10068](https://issues.apache.org/jira/browse/LUCENE-10068) with some 
ideas on what was discussed and a few implementation specs.
   
   I actually think, once we have implemented this double array cache we may be 
able to use it in all places where the current `LRUCache` is used.




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