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There are some critical fixes in ZK 3.5.7 and the first RC has been posted:
https://mail-archives.apache.org/mod_mbox/zookeeper-dev/202002.mbox/%3cCAGH6_KiULzemT-V4x_2ybWeKLMvQ+eh=q-DzsiZ8A-YPP5TY4w@mail.gmail.com%3e
GitHub Pull Request #8125