[FLINK-14516] Remove non credit based network code

• Type: Sub-task
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.9.0
• Fix Version/s: 1.10.0
• Component/s: Runtime / Network
• Labels: pull-request-available
• Release Note: Non credit-based network flow control code was removed alongside of the configuration option {{ taskmanager.network.credit-model }}. Its default value {{true}} is now the only option in Flink.
• Assignee: Piotr Nowojski
• Reporter: Piotr Nowojski
• Created: 24/Oct/19 07:09
• Updated: 21/Jan/20 16:19
• Resolved: 03/Dec/19 08:10

Description

After a survey on the dev mailing list the feedback was that old code path is not used and no longer needed. Based on that we should be safe to drop it and make credit based flow control the only option (currently it's the default).

Issue Links

• supercedes: FLINK-12536 Make BufferOrEventSequence#getNext() non-blocking
• links to: GitHub Pull Request #10347