[branch-4.16] fix: reference counting (retain/release) in PerChannelBookieClient (#4293) #4396
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…pache#4293) ### Motivation This addresses the remaining gaps of apache#4289 in handling ByteBuf retain/release. This PR will also address the concern about NioBuffer lifecycle brought up in the review of the original PR review: apache#791 (comment) . This PR fixes several problems: * ByteString buffer lifecycle in client, follows ByteBufList lifecycle * ByteBufList lifecycle, moved to write promise * Calling of write promises in AuthHandler which buffers messages while authentication is in progress. It was ignoring the promises. ### Changes - add 2 callback parameters to writeAndFlush: cleanupActionFailedBeforeWrite and cleanupActionAfterWrite - use these callback actions for proper cleanup - extract a utility class ByteStringUtil for wrapping ByteBufList or ByteBuf as concatenated zero copy ByteString - properly handle releasing of ByteBufList in the write promise - properly handle calling promises that are buffered while authentication is in progress (cherry picked from commit 0ef2f99) # Conflicts: # bookkeeper-server/src/main/java/org/apache/bookkeeper/proto/PerChannelBookieClient.java
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Cherry-pick #4293 to branch-4.16