smiklosovic commented on code in PR #4521:
URL: https://github.com/apache/cassandra/pull/4521#discussion_r2619556710
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src/java/org/apache/cassandra/db/compression/CompressionDictionaryCache.java:
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@@ -102,7 +102,12 @@ public void add(@Nullable CompressionDictionary
compressionDictionary)
// Only update cache if not already in the cache
DictId newDictId = compressionDictionary.dictId();
- cache.get(newDictId, id -> compressionDictionary);
+ CompressionDictionary cached = cache.get(newDictId, id ->
compressionDictionary);
+ if (cached != compressionDictionary)
+ {
+ compressionDictionary.close();
+ return;
+ }
Review Comment:
this is exercised when doing `refreshDictionaryFromSystemTable` repeatedly
(every `compression_dictionary_refresh_interval`) it is just that in tests,
this will be run also after `compression_dictionary_refresh_initial_delay`
which is 10s so if tests take longer than this then
`refreshDictionaryFromSystemTable` will kick in and it gets here.
My suspicion is that we retrieve last from disk, then we go to cache it but
it is already there so we dont do that, then the rest of the `cache.add` method
finishes and we end up with `CompressionDictionary` from disk nobody is
interested in anymore (because it is cached under a different instance already)
and it is not closed either. So once it is going to be GCed it will leak -
saying that nobody released it yet it goes to be GCed - that's because nobody
called `close()` on it.
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