liudezhi2098 opened a new pull request #6449: Support Consumers Set Custom Retry Delay URL: https://github.com/apache/pulsar/pull/6449 <!-- ### Contribution Checklist - Name the pull request in the form "[Issue XYZ][component] Title of the pull request", where *XYZ* should be replaced by the actual issue number. Skip *Issue XYZ* if there is no associated github issue for this pull request. Skip *component* if you are unsure about which is the best component. E.g. `[docs] Fix typo in produce method`. - Fill out the template below to describe the changes contributed by the pull request. That will give reviewers the context they need to do the review. - Each pull request should address only one issue, not mix up code from multiple issues. - Each commit in the pull request has a meaningful commit message - Once all items of the checklist are addressed, remove the above text and this checklist, leaving only the filled out template below. **(The sections below can be removed for hotfixes of typos)** --> Master Issue: #<6448> ### Motivation For many online business systems, various exceptions usually occur in business logic processing, so the message needs to be re-consumed, but users hope that this delay time can be controlled flexibly. The current user's processing method is usually to send this message to a special retry topic, because production can specify any delay, so consumers subscribe the business topic and retry topic at the same time. I think this logic can be supported by pulsar itself, making it easier for users to use, and it looks like this is a very common requirement. ### Modifications This change can be supported on the client side, need to add a set of interfaces to org.apache.pulsar.client.api.Consumer ```java void reconsumeLater(Message<?> message, long delayTime, TimeUnit unit) throws PulsarClientException; CompletableFuture<Void> reconsumeLaterAsync(Message<?> message, long delayTime, TimeUnit unit); CompletableFuture<Void> reconsumeLaterAsync(Messages<?> messages, int delayLevel); ``` DeadLetterPolicy add retry topic ```java public class DeadLetterPolicy { /** * Maximum number of times that a message will be redelivered before being sent to the dead letter queue. */ private int maxRedeliverCount; /** * Name of the retry topic where the failing messages will be sent. */ private String retryLetterTopic; /** * Name of the dead topic where the failing messages will be sent. */ private String deadLetterTopic; } ``` org.apache.pulsar.client.impl.ConsumerImpl add a retry producer ```java private volatile Producer<T> deadLetterProducer; private volatile Producer<T> retryLetterProducer; ``` Can specify whether to enable retry when creating a consumer，default unenable ```java @Override public ConsumerBuilder<T> enableRetry(boolean retryEnable) { conf.setRetryEnable(retryEnable); return this; } ```
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