[GitHub] [pulsar] codelipenghui commented on a change in pull request #14746: [enh][doc]: describe message ID and enhance the description of sequence ID

[GitBox <gi...@apache.org>]

codelipenghui commented on a change in pull request #14746:
URL: https://github.com/apache/pulsar/pull/14746#discussion_r829916507



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File path: site2/docs/concepts-messaging.md
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@@ -20,10 +20,11 @@ Value / data payload | The data carried by the message. All Pulsar messages cont
 Key | Messages are optionally tagged with keys, which is useful for things like [topic compaction](concepts-topic-compaction.md).
 Properties | An optional key/value map of user-defined properties.
 Producer name | The name of the producer who produces the message. If you do not specify a producer name, the default name is used. 
-Sequence ID | Each Pulsar message belongs to an ordered sequence on its topic. The sequence ID of the message is its order in that sequence.
+Sequence ID | Each Pulsar message belongs to an ordered sequence on its topic. The sequence ID of a message is assigned by its producer, indicating its order in that sequence.<br />Sequence ID can be used for message deduplication. If `brokerDeduplicationEnabled` is set to `true`, the sequence ID of each message is unique within a partition or a non-partitioned topic. 

Review comment:
       1. The sequence ID also can be assigned by users.
   2. The sequence ID of each message is unique within a producer of a topic(nong-partitioned) or a partition




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