add rowsDivisor to modify for RollingFileWriter

[zhaomin1423]

add a config to set rows for rolling file write.

[rdblue]

What is the use case for this setting? Do you have data to show that in some situations, 1000 is too small or too large? A much simpler fix is to update this setting for all tables. I'd like to make sure it is necessary to add a config for this instead of just fixing it.

[aokolnychyi]

It is a large change. I'd also want to get a bit more information to prove it is actually needed.

[rdblue]

I'm closing this until there is a known use case for it. While I appreciate you taking the time to build it, we don't want to add options that are not needed for real-world use. We can reopen this if a use case for it turns up.