<p class="shortdesc"></p> <table class="table" id="Concepts__table_mcf_n5w_cmb"><caption></caption><colgroup><col><col></colgroup><thead class="thead"> <tr class="row"> <th class="entry" id="Concepts__table_mcf_n5w_cmb__entry__1">Name</th> <th class="entry" id="Concepts__table_mcf_n5w_cmb__entry__2">Description</th> </tr> </thead><tbody class="tbody"> <tr class="row"> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__1 "><p class="p">Broker</p></td> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__2 "><p class="p">MQ server. MQ server cluster includes one or more brokers.</p></td> </tr> <tr class="row"> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__1 "><p class="p">Topic</p></td> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__2 "><p class="p">Message theme.Topic used for message classification. Each massage published to the MQ cluster has a topic.</p></td> </tr> <tr class="row"> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__1 "><p class="p">Producer</p></td> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__2 "><p class="p">Message producer, also known as the message publisher, is responsible for producing and sending messages to the broker.</p></td> </tr> <tr class="row"> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__1 "><p class="p">ProducerId</p></td> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__2 "><p class="p">A class of producer tags.</p></td> </tr> <tr class="row"> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__1 "><p class="p">Consumer</p></td> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__2 "><p class="p">Message consumer, also known as message subscriber, is responsible for reading messages from the broker and consuming messages.</p></td> </tr> <tr class="row"> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__1 "><p class="p">ConsumerId</p></td> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__2 "><p class="p">A class of consumer tags.</p></td> </tr> <tr class="row"> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__1 "><p class="p">Tag</p></td> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__2 "><p class="p">Message tag, secondary message type, it needs to be set when the producer client sends messages to further distinguish the messages under a topic.</p></td> </tr> <tr class="row"> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__1 "><p class="p">Message key</p></td> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__2 "><p class="p">Message keyword, set by the message producer.</p></td> </tr> <tr class="row"> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__1 "><p class="p">Message Id</p></td> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__2 "><p class="p">The only ID of a message.</p></td> </tr> <tr class="row"> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__1 "><p class="p">Cluster consumption</p></td> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__2 "><p class="p">All consumers identified by a consumerId share the consumption messages equally. For example, if one topic has 9 messages, and one ConsumerId has 3 instances, each instance consumes 3 messages equally under the cluster consumption mode.</p></td> </tr> <tr class="row"> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__1 "><p class="p">Broadcast consumption</p></td> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__2 "><p class="p">All consumers identified by a ConsumerId will separately consume a message each time. For example, if one topic has 9 messages, and one ConsumerId has 3 instances, each instance will separately consume 9 messages under the broadcast consumption mode.</p></td> </tr> <tr class="row"> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__1 "><p class="p">Delayed message</p></td> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__2 "><p class="p">The message producer sends the message to the broker, but does not expect the message to be delivered immediately. Instead, t is delivered to the consumer for consumption at a delayed time, and the message is a delayed message.</p></td> </tr> <tr class="row"> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__1 "><p class="p">Message filtering</p></td> <td class="entry" headers="Concepts__table_mcf_n5w_cmb__entry__2 "><p class="p">When a consumer client consumes a message, it can filter the message according to the message tag to ensure that only the filtered message type is finally received.</p></td> </tr> </tbody></table>