@jihoonson currently, we can edit a `PeriodDropRule` like this:
```json
{
"type" : "dropByPeriod",
"period" : "P1D"
}
```
The period is from some time in the past to the current time, so this example
will drop last one day data. I think `PeriodDropRule` is a impractical rule for
it will always drop recent data. So people who want to retain the last 30 days
data, they can not use this `PeriodDropRule` but have to do like this: load 30
days, drop forever. Then because of `drop forever` cause issues that @gianm
have listed above.
Maybe we can remove the `PeriodDropRule` because I think few people would like
to use it. Then add a new drop rule which will drop data older than a
configured date.
[ Full content available at:
https://github.com/apache/incubator-druid/issues/5869 ]
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