BookKeeper Ledger Metadata
Pulsar stores data on BookKeeper ledgers, you can understand the contents of a ledger by inspecting the metadata attached to the ledger. Such metadata are stored in the configured metadata store (Oxia, recommended for new clusters, or ZooKeeper) and they are readable using BookKeeper APIs.
Description of current metadata:
| Scope | Metadata name | Metadata value |
|---|---|---|
| All ledgers | application | 'pulsar' |
| All ledgers | component | 'managed-ledger', 'schema', 'compacted-topic' |
| Managed ledgers | pulsar/managed-ledger | name of the ledger |
| Cursor | pulsar/cursor | name of the cursor |
| Compacted topic | pulsar/compactedTopic | name of the original topic |
| Compacted topic | pulsar/compactedTo | id of the last compacted message |