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In Apache Pulsar Beijing Meetup, Sijie Guo and Yong Zhang gave a preview of transaction support in Pulsar 2.5.0. Sijie Guo started with the current state of messaging semantics in Pulsar and talked about the implementation of message deduplication introduced by PIP-6. Then he went into the details of why do we need transaction and how do we implement transaction in Pulsar. Finally Yong walked through the whole transaction execution flow.