[FLINK-36555] Guarantee debloated buffer size grows even with very small alpha

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.19.1
• Fix Version/s: 2.0.0
• Component/s: Runtime / Network, Runtime / Task
• Assignee: Unassigned
• Reporter: Piotr Nowojski
• Created: 16/Oct/24 14:47
• Updated: 25/Oct/24 14:36
• Resolved: 25/Oct/24 14:36

Description

With small buffer sizes and/or small EMA's alpha, currently it can happen buffer size won't grow at all. For example:

• current buffer size is 16b
• max new desired size is only capped at 2 * 16b = 32b
• so with alpha ~= 0.03 (or smaller) the new buffer size would be still 16b

Issue Links

• relates to: FLINK-36556 Allow to configure starting buffer size when using buffer debloating