[FLINK-19083] Remove deprecated DataStream#split

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.12.0
• Component/s: API / DataStream
• Labels: pull-request-available

Release Note

The DataStream#split() operation has been removed after being marked as deprecated for a couple of versions. Please use Side Outputs instead: https://ci.apache.org/projects/flink/flink-docs-stable/dev/stream/side_output.html

• Assignee: Dawid Wysakowicz
• Reporter: Dawid Wysakowicz
• Created: 28/Aug/20 06:56
• Updated: 14/Sep/20 15:26
• Resolved: 14/Sep/20 15:26

Description

DataStream#split() has been deprecated in favour of using Side Outputs because:

• It is less performant, split() creates and checks against Strings for the splitting logic.
• split() was and is buggy : see FLINK-5031 and FLINK-11084, for example
• The semantics of consecutive splits are not very clear in general.
• Side outputs are more general and everything that could be done using split() can be achieved with side outputs with strictly better performance.

Issue Links

• is related to: FLINK-11084 Incorrect ouput after two consecutive split and select
• is related to: FLINK-5031 Consecutive DataStream.split() ignored
• is related to: FLINK-6113 Implement split/select with Side Outputs
• links to: GitHub Pull Request #13343