merlimat opened a new pull request #4102: Reduce number of hashmap sections for ledger handles cache URL: https://github.com/apache/pulsar/pull/4102 ### Motivation The default for `ConcurrentLongHashMap` is to use 16 sections for more lock granularity. This is not needed in the context of the ledger handles cache since this is mostly a read-only map. Reducing the sections will reduce the amount of objects and mem used per topic.
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