wy96f commented on issue #2730: ARTEMIS-2399 Fix performance degradation when there are a lot of subscribers URL: https://github.com/apache/activemq-artemis/pull/2730#issuecomment-505736241 @clebertsuconic We have considered memory usage by page index cache. Out first thought was the usage by index cache is not as much as the pageCursorInfo used by the PageSubscription given the cache wouldn't be removed until all the subscribers have consumed this page where pageCursorfInfo will be removed too. So it's worth although not cheap. But in the case that there are some subscribers not working, the index cache would grow indefinitely while entries in pageCursorInfo are clean up. To make this problem less severe, we can increase the index interval byte size to reduce index cache memory or build a mechanism to evict the index cache?
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