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Why does the flushPendingResponse method have no backpressure?
BUG REPORT
Describe the bug
like org.apache.bookkeeper.proto.PacketProcessorBase#sendResponse, if the client is unable to process in time, use Netty high water level control to avoid FullGC or OOM
Expected behavior
org.apache.bookkeeper.proto.BookieRequestHandler#flushPendingResponse method supports backpressure
Additional context
bookkeeper-4.17