[GitHub] wlliqipeng commented on a change in pull request #794: [RIP-9] Add the introduction of the Operations_Producer in RocketMQ

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wlliqipeng commented on a change in pull request #794: [RIP-9] Add the introduction of the Operations_Producer in RocketMQ
URL: https://github.com/apache/rocketmq/pull/794#discussion_r258339738
 
 

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 File path: docs/en/Operations_Producer.md
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+### Producer
+----
+##### 1 Message Sending Tips
+###### 1.1 The Use of Tags
+One instance should use one topic as much as possible and the subtype of messages can be marked by tags. Tag provides extra flexibility to users. In the consume subscribing process, the messages filtering can only be handled by using tags when the tags are specified in the message sending process: `message.setTags("TagA")`
+###### 1.2 The Use of Keys
+A business  key can be set in one message and it will be easier to look up the message on a broker server to diagnose issues during development. Each message will be created index(hash index) by server, instance can query the content of this message by topic and key and who consumes the message.Because of the hash index, make sure that the key should be unique in order to avoid potential hash index conflict.
 
 Review comment:
   The first sentence seems to be inaccurate.

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