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由 Jia Zhai 提交于
Fixes #4909 ### Motivation It would be good to expose method `getLastMessageId` in `ConsumerImpl` to a public method. eg. some times user would like to know the lag messages; or only consume messages before current time. ### Modifications - expose method `getLastMessageId` in consumer api. - add unit test. ### Verifying this change Ut passed (cherry picked from commit 93d95c74)
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