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Posted to dev@rocketmq.apache.org by GitBox <gi...@apache.org> on 2020/03/02 06:16:53 UTC
[GitHub] [rocketmq] wuqinghai opened a new issue #1815: When consuming a
batch of messages, some messages cannot be rolled back,
only all messages can be rolled back
wuqinghai opened a new issue #1815: When consuming a batch of messages, some messages cannot be rolled back, only all messages can be rolled back
URL: https://github.com/apache/rocketmq/issues/1815
Consumer code:
consumer.registerMessageListener(new MessageListenerConcurrently() {
@Override
public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
ConsumeConcurrentlyContext context) {
System.out.println("接收新消息的线程: "+ Thread.currentThread().getName() +"，消息数: "+msgs.size());
for (int i = 0; i < msgs.size(); i++) {
MessageExt ext = msgs.get(i);
if (i ==5) {
System.out.println("第"+(i)+"条消息消费失败，需要重试");
context.setAckIndex(i);
return ConsumeConcurrentlyStatus.RECONSUME_LATER;
}
System.out.println("第"+(i)+"条消息消费成功，"+ ext.getTopic()+":"+new String(ext.getBody(), Charset.forName("utf-8")));
}
return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
}
});
if consumer return ConsumeConcurrentlyStatus.RECONSUME_LATER, Consermer'll get all the news of msgs.
Why do you write like this？
Why reset it to - 1？
org.apache.rocketmq.client.impl.consumer.ConsumeMessageConcurrentlyService#processConsumeResult
switch (status) {
case CONSUME_SUCCESS:
if (ackIndex >= consumeRequest.getMsgs().size()) {
ackIndex = consumeRequest.getMsgs().size() - 1;
}
int ok = ackIndex + 1;
int failed = consumeRequest.getMsgs().size() - ok;
this.getConsumerStatsManager().incConsumeOKTPS(consumerGroup, consumeRequest.getMessageQueue().getTopic(), ok);
this.getConsumerStatsManager().incConsumeFailedTPS(consumerGroup, consumeRequest.getMessageQueue().getTopic(), failed);
break;
case RECONSUME_LATER:
ackIndex = -1;
this.getConsumerStatsManager().incConsumeFailedTPS(consumerGroup, consumeRequest.getMessageQueue().getTopic(),
consumeRequest.getMsgs().size());
break;
default:
break;
}
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[GitHub] [rocketmq] duhenglucky closed issue #1815: 当消费一批消息时如20条，中间的第5条出现问题，直接返回ConsumeConcurrentlyStatus.RECONSUME_LATER，设置ackIndex为4后，还是会收到全部的20条消息进行重试，为什么不是收到acdIndex后面的消息？
Posted by GitBox <gi...@apache.org>.
duhenglucky closed issue #1815: 当消费一批消息时如20条，中间的第5条出现问题，直接返回ConsumeConcurrentlyStatus.RECONSUME_LATER，设置ackIndex为4后，还是会收到全部的20条消息进行重试，为什么不是收到acdIndex后面的消息？
URL: https://github.com/apache/rocketmq/issues/1815
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[GitHub] [rocketmq] duhenglucky commented on issue #1815: 当消费一批消息时如20条，中间的第5条出现问题，直接返回ConsumeConcurrentlyStatus.RECONSUME_LATER，设置ackIndex为4后，还是会收到全部的20条消息进行重试，为什么不是收到acdIndex后面的消息？
Posted by GitBox <gi...@apache.org>.
duhenglucky commented on issue #1815: 当消费一批消息时如20条，中间的第5条出现问题，直接返回ConsumeConcurrentlyStatus.RECONSUME_LATER，设置ackIndex为4后，还是会收到全部的20条消息进行重试，为什么不是收到acdIndex后面的消息？
URL: https://github.com/apache/rocketmq/issues/1815#issuecomment-593700589
@wuqinghai 还是希望降低用户的使用门槛，返回一个值就够了，大部分时候，在没有消费堆积的情况下，每一批的量是很少的。
issue一般用作bug fix或者是feature request，相关的讨论最好还是在邮件列表里面，这样能够沉淀下来，而且被搜索到:)，可以订阅一下：https://rocketmq.apache.org/about/contact/
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