gvaysman-at-github opened a new issue, #12000:
URL: https://github.com/apache/lucene/issues/12000
### Description
When the web application that uses Lucene Facets is shut down (say, from
Tomcat Manager app), ThreadLocal<BytesRefBuilder> from UTF8TaxonomyWriterCache
(the field bytes) is never cleaned up.
As a result, not only Tomcat complains of possible thread leak, the heap
dump confirms this (below).
The code examination (including the latest lucene-facet 9.4.2) shows no
bytes.remove() anywhere. Just clearing the BytesRefBuilder internal array is
not sufficient.
Tomcat outputs to the console the following:
SEVERE [Thread-213]
org.apache.catalina.loader.WebappClassLoaderBase.checkThreadLocalMapForLeaks
The web application [mh] created a ThreadLocal with key of type
[org.apache.lucene.facet.taxonomy.writercache.UTF8TaxonomyWriterCache$1] (value
[org.apache.lucene.facet.taxonomy.writercache.UTF8TaxonomyWriterCache$1@4c6f99ab])
and a value of type [org.apache.lucene.util.BytesRefBuilder] (value [Unknown])
but failed to remove it when the web application was stopped. Threads are going
to be renewed over time to try and avoid a probable memory leak.
Heap dump shows that the web app class loader, with all statics, etc.
(unrelated to Lucene), cannot be released because of this leak
### Version and environment details
_No response_
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