Invalid entries in the cache manager are not garbage collected until the
CachedItem is reused
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Key: DERBY-2700
URL: https://issues.apache.org/jira/browse/DERBY-2700
Project: Derby
Issue Type: Bug
Components: Services
Affects Versions: 10.2.2.0, 10.2.1.6, 10.3.0.0
Reporter: Knut Anders Hatlen
Assigned To: Knut Anders Hatlen
When an entry in the cache manager becomes invalid (for instance because a
table is dropped), it cannot be garbage collected because we only set the
valid_ field in CachedItem to false. We should also set entry to null to make
the Cacheable eligible for garbage collection. Currently, invalid cached
objects cannot be garbage collected until their CachedItems are reused. This
causes Derby to hold on to resources too long, and can in the worst case lead
to an OutOfMemoryError.
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