[GitHub] [pulsar] MarvinCai added a comment to the discussion: what is "滚动策略循环"?

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GitHub user MarvinCai added a comment to the discussion: what is "滚动策略循环"?

Rollover means delete old(consumed) ledgers and make room for new ledgers.
Ledger is append only and will not be writable once closed/fenced.
Ledger can only be deleted as a whole, so all entries on a ledger has to be consumed and acked by consumers(or auto acked by ttl).
Broker will scan ledger at background and if a ledger is fullly consumer(all entries are consumed) & (ledger exists more than configured retention period || total storage size for a topic cross max retion size), then it's marked for delete(rollover).


GitHub link: https://github.com/apache/pulsar/discussions/18471#discussioncomment-4254595

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