[GitHub] rdhabalia opened a new pull request #3584: [pulsar-broker] provide option to disable redelivery-tracker to reduce in memory positionImpl footprint and gc improvement

[GitBox <gi...@apache.org>]

rdhabalia opened a new pull request #3584: [pulsar-broker] provide option to disable redelivery-tracker to reduce in memory positionImpl footprint and gc improvement
URL: https://github.com/apache/pulsar/pull/3584
 
 
   ### Motivation
   
   Right now, broker captures every redelivered message-id for each subscription in memory even though client doesn't need dead-letter-topic feature. Because of that, sometimes clients who has high redelivery-message rate builds large number of objects and it can go up to 6M `positionImpl` objects into memory and it can take up to 200MB of heap-size which cause very high gc pause in broker and makes broker unstable. 
   So, broker should have a way to limit and disable to store and track these objects.
   
   ### Modification
   Option to disable redelivery-tracker.
   
   ### Note
   I will create a separate PR which can allow admin to add policy to enable this feature for white-listed namespace and not for all the the topics. and it will also have some limitation in terms of keeping number of message-ids.
   

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