[GitHub] [bookkeeper] horizonzy commented on pull request #3913: Enable PCBC completionObjects autoShrink to reduce memory usage and gc

["horizonzy (via GitHub)" <gi...@apache.org>]

horizonzy commented on PR #3913:
URL: https://github.com/apache/bookkeeper/pull/3913#issuecomment-1505400156

   > ConcurrentOpenHashMap default DefaultConcurrencyLevel=16. We have hundreds of bookie nodes. Due to the feature of bookie polling and writing, the client and server have long connection characteristics, which will as a result, the memory usage of about 65552 * 16 * 1776 = 1.74GB cannot be recycled, and the space take up by these tables is all size=0 (The broker's owner topic has drifted to other brokers due to Full GC).
   
   I have a question about this. The memory occupation is not about the array size. The key(CompletionKey) and the value(CompletionValue) is the occupier. As long as the key and the value is removed, the memory occupation will be decrease.
   We make the array size autoShrink didn't help the GC


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