Upstream https://github.com/apache/pulsar/pull/18245 #19
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…m storage/cache to the write to the consumer channel) Motivation: Broker can go out of memory due to many reads enqueued on the PersistentDispatcherMultipleConsumers dispatchMessagesThread (that is used in case of dispatcherDispatchMessagesInSubscriptionThread set to true, that is the default value) The limit of the amount of memory retained due to reads MUST take into account also the entries coming from the Cache. When dispatcherDispatchMessagesInSubscriptionThread is false (the behaviour of Pulsar 2.10) there is some kind of natural (but still unpredictable!!) back pressure mechanism because the thread that receives the entries from BK of the cache dispatches immediately and synchronously the entries to the consumer and releases them Modifications: - Add a new component (InflightReadsLimiter) that keeps track of the overall amount of memory retained due to inflight reads. - Add a new configuration entry managedLedgerMaxReadsInFlightSizeInMB - The feature is disabled by default - Add new metrics to track the values
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