GitHub user backender opened a pull request: https://github.com/apache/kafka/pull/2669
KAFKA-4772: [WIP] Use peek to implement print **PROPOSAL/DISCUSSION FOR KIP-132.** Tackles [KAFKA-4772](https://issues.apache.org/jira/browse/KAFKA-4772) and [KAFKA-4830](https://issues.apache.org/jira/browse/KAFKA-4830). The functionaliy of KeyValuePrinter is replaced with a printAction that is being passed to KStreamPeek. We therefore can get rid of KeyValuePrinter. KStream.print was extended to handle KeyValueMapper in order to provide users the option to change output of K and V. Therefore, constructors of KeyValuePrinter as well as KeyValuePrinterProcessor have to be adapted. The default case where no mapper will be passed, is still covered by the previous comma separated out of K, V. You can merge this pull request into a Git repository by running: $ git pull https://github.com/delftswa2017/kafka fix-kafka-4772-4830 Alternatively you can review and apply these changes as the patch at: https://github.com/apache/kafka/pull/2669.patch To close this pull request, make a commit to your master/trunk branch with (at least) the following in the commit message: This closes #2669 ---- commit cfa86a243c0d0785ff00bfe9fc3950180406c65f Author: Marc Juchli <m...@marcjuch.li> Date: 2017-03-10T14:28:04Z Use peek to implement print The functionaliy of KeyValuePrinter is replaced with a printAction that is being passed to KStreamPeek. We therefore can get rid of KeyValuePrinter. KStream.print was extended to handle KeyValueMapper in order to provide users the option to change output of K and V. Therefore, constructors of KeyValuePrinter as well as KeyValuePrinterProcessor have to be adapted. The default case where no mapper will be passed, is still covered by the previous comma separated out of K, V. ---- --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---