smiklosovic commented on code in PR #4514:
URL: https://github.com/apache/cassandra/pull/4514#discussion_r2592761187
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src/java/org/apache/cassandra/io/compress/ZstdDictionaryCompressor.java:
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Review Comment:
not particularly related to this patch but this just got me thinking ...
`instancePerDict` is a cache where entries are expired after
`DatabaseDescriptor.getCompressionDictionaryCacheExpireSeconds()`. We also have
invalidate method which clears this, for testing purposes.
What happens with `instancesPerLevel` map content? We are not cleaning this
up anywhere. This is populated in `getOrCreate` if dictionary is null. That is
basically when I do `create table abc with compression = { zstddict,
compression_level: ..... various levels ....}
When I alter a table across all possible levels there there will be at most
as many entries in this map as many possible levels there are? Minimum is 1 and
max is 22 so this will have 22 entries ever at most, never GCed?
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