codelipenghui opened a new pull request #2508: PIP-22: Dead Letter Topic URL: https://github.com/apache/incubator-pulsar/pull/2508 When consumer got messages from pulsar, It's difficult to ensure every message can be consume success. Pulsar support message redelivery feature by set acknowledge timeout when create a new consumer. This is a good feature guarantee consumer will not lost messages. But however, some message will redelivery so many times possible, even to the extent that it can be never stop. So, It's necessary to support a feature to control it by pulsar. Users can use this feature and customize this feature to control the message redelivery behavior. The feature named Dead Letter Topic. Modifications Consumer can set maximum number of redeliveries by java client. Consumer can set the name of Dead Letter Topic by java client, It’s not necessary. Message exceeding the maximum number of redeliveries should send to Dead Letter Topic and acknowledged automatic. Result If consumer enable future of dead letter topic. When Message exceeding the maximum number of redeliveries, message will send to the Dead Letter Topic and acknowledged automatic.
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