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Posted to dev@rocketmq.apache.org by GitBox <gi...@apache.org> on 2019/12/23 09:26:32 UTC
[GitHub] [rocketmq] weavernet opened a new issue #1673: Why there is a
pullMessageService in Producer ?
weavernet opened a new issue #1673: Why there is a pullMessageService in Producer ?
URL: https://github.com/apache/rocketmq/issues/1673
I've found there is a `pullMessageService` start process when a `Producer` starts. I think the `pullMessageService` is used for pulling message from broker. It seem's like `Producer` doesn't need to pull any message from broker.
So, what does the `pullMessageService` do in `Producer`? Thank you.
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[GitHub] [rocketmq] weavernet commented on issue #1673: Why there is a
pullMessageService in Producer ?
Posted by GitBox <gi...@apache.org>.
weavernet commented on issue #1673: Why there is a pullMessageService in Producer ?
URL: https://github.com/apache/rocketmq/issues/1673#issuecomment-568738428
> You have got the answer yourself :)
> The `pullMessageService` is used for pulling messages from the broker, and that is how producer exactly works. In other words, `Producer` uses `pullMessageService` to pull messages from the brokers
I think `Producer` is pushing message to `Broker`, not pulling message from `Broker`.
If `Producer` pull message from `Broker`, what does the broker do with the message?
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[GitHub] [rocketmq] xiangwangcheng commented on issue #1673: Why there is a
pullMessageService in Producer ?
Posted by GitBox <gi...@apache.org>.
xiangwangcheng commented on issue #1673: Why there is a pullMessageService in Producer ?
URL: https://github.com/apache/rocketmq/issues/1673#issuecomment-568774798
@weavernet Sorry, now I get you. Both the producer and consumer have the MQClientInstance object as a property. Now the truth is either a producer of a consumer is created, A MQClientInstance attached with a pullMessageService is inited. Indeed, when it is a producer, the pullMessageService is useless.
But if we both have consumer and producer in one process(they share one MQClientInstance instance),
the pullMessageService is used for consumer, pulling messages.
So IMO, init a pullMessageService in MQClientInstance is a rough, simple but useful way, for it is kind of difficult to know whether the client is a producer or consumer, or both of them.
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[GitHub] [rocketmq] xiangwangcheng commented on issue #1673: Why there is a
pullMessageService in Producer ?
Posted by GitBox <gi...@apache.org>.
xiangwangcheng commented on issue #1673: Why there is a pullMessageService in Producer ?
URL: https://github.com/apache/rocketmq/issues/1673#issuecomment-568736156
You have got the answer yourself :)
The `pullMessageService` is used for pulling messages from the broker, and that is how producer exactly works. In other words, `Producer` uses `pullMessageService` to pull messages from the brokers
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[GitHub] [rocketmq] duhenglucky closed issue #1673: Why there is a
pullMessageService in Producer ?
Posted by GitBox <gi...@apache.org>.
duhenglucky closed issue #1673: Why there is a pullMessageService in Producer ?
URL: https://github.com/apache/rocketmq/issues/1673
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