[client] fix writeLac memory leak and thread safety issue - #4713

[client] fix writeLac memory leak and thread safety issue#4713

wenbingshen merged 4 commits into

apache:masterapache/bookkeeper:masterfrom

wenbingshen:wenbing/fix_writeLac_memoryLeakwenbingshen/bookkeeper:wenbing/fix_writeLac_memoryLeakCopy head branch name to clipboard