Integration / Apache Pulsar Interview questions
What is tiered storage in Pulsar?
Tiered storage lets Pulsar automatically offload older message segments from BookKeeper to cheaper, long-term storage like Amazon S3, Google Cloud Storage, or Azure Blob once they age past a configured threshold.
Offloaded segments remain fully readable through the same topic and consumer APIs - Pulsar transparently fetches them from the offload target when a consumer needs to read that far back - so there's no separate archive workflow to manage.
This decouples retention length from BookKeeper disk cost, letting teams keep months or years of history queryable without provisioning that much expensive replicated disk on the bookies themselves.
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