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https://issues.apache.org/jira/browse/KAFKA-16666?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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黃竣陽 updated KAFKA-16666:
------------------------
    Description: 
`GroupMetadataMessageFormatter`[0], `OffsetsMessageFormatter`[1], and 
`TransactionLogMessageFormatter`[2] are used by ConsoleConsumer to parse data 
of internal topics. Following the migration plan, we should move them to 
tools-api module. Also, we need to keep the compatibility of command line. 
-That is to say, `ConsoleConsumer` can accept the previous package name and 
then use the (java) implementation to parse and make same output.-

The Scala Formatter output is not json format, thus the new Java Formatter will 
leverage the protocol by json mechanism.

[0]

[0] 
[https://github.com/apache/kafka/blob/376e9e20dbf7c7aeb6f6f666d47932c445eb6bd1/core/src/main/scala/kafka/coordinator/group/GroupMetadataManager.scala#L1269]
[1] 
[https://github.com/apache/kafka/blob/376e9e20dbf7c7aeb6f6f666d47932c445eb6bd1/core/src/main/scala/kafka/coordinator/group/GroupMetadataManager.scala#L1248]
[2] 
[https://github.com/apache/kafka/blob/9b8aac22ec7ce927a2ceb2bfe7afd57419ee946c/core/src/main/scala/kafka/coordinator/transaction/TransactionLog.scala#L145]

  was:
`GroupMetadataMessageFormatter`[0], `OffsetsMessageFormatter`[1], and 
`TransactionLogMessageFormatter`[2] are used by ConsoleConsumer to parse data 
of internal topics. Following the migration plan, we should move them to 
tools-api module. Also, we need to keep the compatibility of command line. That 
is to say, `ConsoleConsumer` can accept the previous package name and then use 
the (java) implementation to parse and make same output.

[0] 
https://github.com/apache/kafka/blob/376e9e20dbf7c7aeb6f6f666d47932c445eb6bd1/core/src/main/scala/kafka/coordinator/group/GroupMetadataManager.scala#L1269
[1] 
https://github.com/apache/kafka/blob/376e9e20dbf7c7aeb6f6f666d47932c445eb6bd1/core/src/main/scala/kafka/coordinator/group/GroupMetadataManager.scala#L1248
[2] 
https://github.com/apache/kafka/blob/9b8aac22ec7ce927a2ceb2bfe7afd57419ee946c/core/src/main/scala/kafka/coordinator/transaction/TransactionLog.scala#L145


> Migrate `TransactionLogMessageFormatter`, GroupMetadataMessageFormatter` and 
> `OffsetsMessageFormatter`to tools module
> ---------------------------------------------------------------------------------------------------------------------
>
>                 Key: KAFKA-16666
>                 URL: https://issues.apache.org/jira/browse/KAFKA-16666
>             Project: Kafka
>          Issue Type: Improvement
>            Reporter: Chia-Ping Tsai
>            Assignee: 黃竣陽
>            Priority: Minor
>              Labels: need-kip
>
> `GroupMetadataMessageFormatter`[0], `OffsetsMessageFormatter`[1], and 
> `TransactionLogMessageFormatter`[2] are used by ConsoleConsumer to parse data 
> of internal topics. Following the migration plan, we should move them to 
> tools-api module. Also, we need to keep the compatibility of command line. 
> -That is to say, `ConsoleConsumer` can accept the previous package name and 
> then use the (java) implementation to parse and make same output.-
> The Scala Formatter output is not json format, thus the new Java Formatter 
> will leverage the protocol by json mechanism.
> [0]
> [0] 
> [https://github.com/apache/kafka/blob/376e9e20dbf7c7aeb6f6f666d47932c445eb6bd1/core/src/main/scala/kafka/coordinator/group/GroupMetadataManager.scala#L1269]
> [1] 
> [https://github.com/apache/kafka/blob/376e9e20dbf7c7aeb6f6f666d47932c445eb6bd1/core/src/main/scala/kafka/coordinator/group/GroupMetadataManager.scala#L1248]
> [2] 
> [https://github.com/apache/kafka/blob/9b8aac22ec7ce927a2ceb2bfe7afd57419ee946c/core/src/main/scala/kafka/coordinator/transaction/TransactionLog.scala#L145]



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