[GitHub] [rocketmq] francisoliverlee opened a new issue #1159: resetOffset retry topic fail using console for cpp client

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francisoliverlee opened a new issue #1159:
URL: https://github.com/apache/rocketmq/issues/1159


   The issue tracker is **ONLY** used for bug report(feature request need to follow [RIP process](https://github.com/apache/rocketmq/wiki/RocketMQ-Improvement-Proposal)). Keep in mind, please check whether there is an existing same report before your raise a new one.
   
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   **BUG REPORT**
   
   1. Please describe the issue you observed:
       
   - What did you do (The steps to reproduce)?
      1. send reset command for retry topic using rmq console
      2. console return success, but no any offset changes
   
   - What did you expect to see?
      offset changed to the time i tell console
   - What did you see instead?
      console return success, but no any offset changes
   
   2. Please tell us about your environment:
       client : cpp
       rmq console: from externals
       os: centos 7.4
   3. Other information (e.g. detailed explanation, logs, related issues, suggestions how to fix, etc):
      cpp log: 
   18:54:41.319764](info):topic:%RETRY%ai-high-level-processor, group:ai-high-level-processor, timestamp:1555325640000, isForce:0,isForce:false
   [2019-Apr-15 18:54:41.319815](error):ResetOffsetBody::Decode fail
   [2019-Apr-15 18:54:41.319828](error):resetOffset failed as received data could not be unserialized
   [2019-Apr-15 18:54:41.321733](info):topic:%RETRY%ai-high-level-processor, group:ai-high-level-processor, timestamp:1555325640000, isForce:0,isForce:false
   [2019-Apr-15 18:54:41.321776](error):ResetOffsetBody::Decode fail
   [2019-Apr-15 18:54:41.321789](error):resetOffset failed as received data could not be unserialized
   **FEATURE REQUEST**
   
   
   my analytics:
   my guess:
   from cpp log we can see , cpp can not Decode resetoffset command body from broker. 
   maybe broker send with wrong encoding.
   
   check guess:
   resetoffset command process:
   console (java) -> broker  --> client
   step 1. broker choose java-format to encode resetoffset body
   ![image](https://user-images.githubusercontent.com/5908412/56136501-810fc080-5fc5-11e9-96e7-5080fa64e251.png)
   step 2. cpp decode body with cpp-format, absolutely fail　
   
   
   how-to-fix:
   when console call broker to resetOffset, console must know what client-languages for all-connected-client, so send resetOffset use the RIGHT-LANGUAGE to call broker.
   


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