dump-file-keep-num和dump-file-keep-hour只在从节点生效。

[takenliu]

Description

dump-file-keep-num和dump-file-keep-hour只在从节点生效。 假设主节点A和从节点B，起初没有设置这两个参数，B节点的dump目录已经有较多binlog文件。这时候发生主从切换，再设置这两个参数的时候，因为B节点提成了主节点，不会触发清理binlog文件的逻辑。

Expected Behavior

Current Behavior

Possible Solution

Steps to Reproduce (for bugs)

Context

Your Environment

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