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marwei / how_to_reset_kafka_consumer_group_offset.md
Created November 9, 2017 23:39
How to Reset Kafka Consumer Group Offset

Kafka 0.11.0.0 (Confluent 3.3.0) added support to manipulate offsets for a consumer group via cli kafka-consumer-groups command.

  1. List the topics to which the group is subscribed
kafka-consumer-groups --bootstrap-server <kafkahost:port> --group <group_id> --describe

Note the values under "CURRENT-OFFSET" and "LOG-END-OFFSET". "CURRENT-OFFSET" is the offset where this consumer group is currently at in each of the partitions.

  1. Reset the consumer offset for a topic (preview)



  


  




    


          
    

      

        
        

          

              @ncouture
          

          

            
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                Oauth2 Explanation
              
          

        

      

        

  

      

    
OAUTH2


The Problem


I’m a web app that wants to allow other web apps access to my users’ information, but I want to ensure that the user says it’s ok.


The Solution


I can’t trust the other web apps, so I must interact with my users directly.  I’ll let them know that the other app is trying to get their info, and ask whether they want to grant that permission.  Oauth defines a way to initiate that permission verification from the other app’s site so that the user experience is smooth.  If the user grants permission, I issue an AuthToken to the other app which it can use to make requests for that user's info.


Note on encryption


Oauth2 has nothing to do with encryption -- it relies upon SSL to keep things (like the client app’s shared_secret) secure.