NewPeriodic creates a new instance of Periodic compactor that purges the log older than h Duration.

NewRevision creates a new instance of Revisonal compactor that purges the log older than retention revisions from the current revision.

Periodic compacts the log by purging revisions older than the configured retention time.

Revision compacts the log by purging revisions older than the configured reivison number.

Compactor purges old log from the storage periodically.