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When batching is enabled, the producer accumulates and sends a batch of messages in a single request. Pulsar currently supports the following types of compression: You can compress messages published by producers during transportation. For more information, see ProducerAccessMode in ProducerBuilder.java file. You can set producer access mode through Java Client API. Any other producers trying to produce messages on this topic will either get errors immediately or have to wait until they get the Exclusive access.įor more information, see PIP 68: Exclusive Producer. Once an application creates a producer with Exclusive or WaitForExclusive access mode successfully, the instance of this application is guaranteed to be the only writer to the topic. Consequently, if you want to implement the leader election scheme for your application, you can use this access mode. The producer that succeeds in becoming the exclusive one is treated as the leader. If there is already a producer connected, the producer creation is pending (rather than timing out) until the producer gets the Exclusive access. The “old” producer is evicted and a “new” producer is selected to be the next exclusive producer if the “old” producer experiences a network partition with the broker. If there is already a producer connected, other producers trying to publish on this topic get errors immediately. Only one producer can publish on a topic. Multiple producers can publish on a topic. You can have different types of access modes on topics for producers.

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If the queue is full (you can configure the maximum size), the producer is blocked or fails immediately when calling the API, depending on arguments passed to the producer. The client library sends the message to the broker in the background. The producer puts a message in a blocking queue and returns immediately. If the acknowledgment is not received, the producer treats the sending operation as a failure. The producer waits for an acknowledgement from the broker after sending every message. Producers send messages to brokers synchronously (sync) or asynchronously (async). The Pulsar broker processes the messages. Producers Ī producer is a process that attaches to a topic and publishes messages to a Pulsar broker. You can configure the max size of a message with the following configurations.įor more information on Pulsar messages, see Pulsar binary protocol. If nothing is set to event time, the value is 0. For example, applications attach a timestamp on when the message is processed. The timestamp is automatically applied by the producer.Īn optional timestamp attached to a message by applications. The timestamp of when the message is published.

Message ID indicates a message’s specific position in a ledger and is unique within a Pulsar cluster. The message ID of a message is assigned by bookies as soon as the message is persistently stored. If brokerDeduplicationEnabled is set to true, the sequence ID of each message is unique within a producer of a topic (non-partitioned) or a partition. Sequence ID can be used for message deduplication. The sequence ID of a message is initially assigned by its producer, indicating its order in that sequence, and can also be customized. The version number of the schema that the message is produced with.Įach Pulsar message belongs to an ordered sequence on its topic. The name of the topic that the message is published to. If you do not specify a producer name, the default name is used. The name of the producer who produces the message. Messages are optionally tagged with keys, which is useful for things like topic compaction.Īn optional key/value map of user-defined properties. All Pulsar messages contain raw bytes, although message data can also conform to data schemas. The following table lists the components of messages. If the consumption of a message fails and you want this message to be consumed again, you can enable message redelivery mechanism to request the broker to resend this message. The retained messages are discarded only when a consumer acknowledges that all these messages are processed successfully. When a subscription is created, Pulsar retains all messages, even if the consumer is disconnected. In this pattern, producers publish messages to topics consumers subscribe to those topics, process incoming messages, and send acknowledgements to the broker when processing is finished. Pulsar is built on the publish-subscribe pattern (often abbreviated to pub-sub).

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