smiklosovic commented on code in PR #4521:
URL: https://github.com/apache/cassandra/pull/4521#discussion_r2619483976
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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:
the logic here is that if the returned `cached` instance is different from
`compressionDictionary`, then there is already cached dictionary under same
dictionary id, so it is presumably same dictionary, so we do not need to do
anything except closing it and returning.
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