[KAFKA-3794] Add Stream / Table prefix in print functions

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.10.1.0
• Component/s: streams
• Labels: newbie user-experience
• Assignee: Bill Bejeck
• Reporter: Guozhang Wang
• Created: 06/Jun/16 20:52
• Updated: 06/Jul/16 17:47
• Resolved: 06/Jul/16 17:46

Description

Currently the KTable/KStream.print() operator will print the key-value pair as it was forwarded to this operator. However, if there are multiple operators in the topologies with the same PrintStream (e.g. stdout), their printed key-value pairs will be interleaving on that stream channel.

Hence it is better to add a prefix for different KStream/KTable.print operators. One proposal:

1) For KTable, it inherits a table name when created, and we can use that name as the prefix as [table-name]: key, value.

2) For KStream, we can overload the function with an additional "name" parameter that we use as the prefix; if it is not specified, then we can use the parent processor node name, which has the pattern like KSTREAM-JOIN-suffix_index.

Issue Links

• links to: GitHub Pull Request #1577