Hello, We have a reader cache that depends on the memory usage for each reader. We found the calculation of reader size for doc values to be under counting.
See line: https://github.com/apache/lucene-solr/blob/master/lucene/core/src/java/org/apache/lucene/codecs/lucene80/Lucene80DocValuesProducer.java#L69 Looks like the memory estimate is only using the shallow size of the class, and does not include the objects stored in the maps: https://github.com/apache/lucene-solr/blob/master/lucene/core/src/java/org/apache/lucene/codecs/lucene80/Lucene80DocValuesProducer.java#L55 We made a local patch and saw a significant difference in reported size. Please let us know if this is the right thing to do, we are happy to contribute our patch. Thanks -John
