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From GitBox <...@apache.org>
Subject [GitHub] [pulsar] liudezhi2098 opened a new issue #6448: Support Consumers Set Custom Retry Delay
Date Sun, 01 Mar 2020 08:01:59 GMT
liudezhi2098 opened a new issue #6448: Support Consumers Set Custom Retry Delay
URL: https://github.com/apache/pulsar/issues/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.
   
   ## Proposed changes
   
   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´╝îdefault unenable
   ```java
       @Override
       public ConsumerBuilder<T> enableRetry(boolean retryEnable) {
           conf.setRetryEnable(retryEnable);
           return this;
       }
   ```
   

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