Lae created LUCENE-7652:
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Summary: LRUQueryCache / IndexSearcher.DEFAULT_QUERY_CACHE memory
leak
Key: LUCENE-7652
URL: https://issues.apache.org/jira/browse/LUCENE-7652
Project: Lucene - Core
Issue Type: Bug
Components: core/search
Affects Versions: 5.5, 5.4
Reporter: Lae
Priority: Critical
Our {{IndexSearcher.DEFAULT_QUERY_CACHE}} is set to use 32MB of heap (the
default), however upon inspection of our application's heap, it's retaining
~280MB of memory and increasing slowly.
{{LRUQueryCache.cache.size}} was at 12,099, and
{{LRUQueryCache.cache.modCount}} was also 12,099, meaning nothing was removed
from {{LRUQueryCache.cache}} at all.
The keys of {{LRUQueryCache.cache}} are instances of {{SegmentCoreReaders}},
and I've checked many of the keys, the only reference to them is
{{LRUQueryCache.cache}}, given {{LRUQueryCache.cache}} is an
{{IdentityHashMap}}, that means you can't even get to them outside of the cache
because you can't get a key that's equivalent to one of these in the cache.
This affectively makes {{IndexSearcher.DEFAULT_QUERY_CACHE}} a memory black
hole.
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