问题找到了, 心跳问题, master 和slave 心跳间隔都是5秒, master 一直发心跳, salve 收到心跳后, 更新lastWriteTime的值, 导致slave 一直不发心跳, master在20s内, 没收到slave 心跳, 就认为slave 断开了, 就关闭了连接. 后面将master心跳 改为10S, slave不变, interval都改为30S, 问题解决
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