[SOLR-15350] fieldCache stats contain entries for other things (a regression)

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 9.0
• Component/s: metrics
• Assignee: Unassigned
• Reporter: David Smiley
• Created: 16/Apr/21 21:06
• Updated: 23/Jun/21 13:49

Description

Accessing the MBean stats for the fieldCache on main (9x) are polluted with entries for other MBeans.  This problem does not appear on 8x.

On 8x, using the docker image:
docker run --rm --name solr -p 8983:8983 solr:8 solr-demo
Then access this URL:
http://localhost:8983/solr/demo/admin/mbeans?key=fieldCache&stats=true
You'll see only two stats entries:

"stats":{
          "CACHE.core.fieldCache.entries_count":0,
          "CACHE.core.fieldCache.total_size":"0 bytes"}}},

But on main/9x, there are lots of stats entries with prefixes for other MBeans:

"stats":{
          "CORE.fs.totalSpace":499963174912,
          "CORE.coreName":"benchifi-org01",
          "INDEX.sizeInBytes":86685426,
          "SEARCHER.new.errors":0,
          "CORE.refCount":2,
          "CACHE.core.fieldCache.total_size":"0 bytes",
...