Transactions Guarantee

Pulsar transactions support the following guarantee.

Atomic multi-partition writes and multi-subscription acknowledges

Transactions enable atomic writes to multiple topics and partitions. A batch of messages in a transaction can be received from, produced to, and acknowledged by many partitions. All the operations involved in a transaction succeed or fail as a single unit.

Read transactional message

All the messages in a transaction are available only for consumers until the transaction is committed.

Acknowledge transactional message

A message is acknowledged successfully only once by a consumer under the subscription when acknowledging the message with the transaction ID.