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 on ZooKeeper and they are readable using BookKeeper APIs.

    Description of current metadata:

    范围Metadata nameMetadata value
    All ledgersapplication‘pulsar’
    All ledgerscomponent‘managed-ledger’, ‘schema’, ‘compacted-topic’
    Managed ledgerspulsar/managed-ledgername of the ledger
    Cursorpulsar/cursorname of the cursor
    Compacted topicpulsar/compactedTopicname of the original topic
    Compacted topicpulsar/compactedToid of the last compacted message