[FLINK-12576] inputQueueLength metric does not work for LocalInputChannels

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.6.4, 1.7.2, 1.8.0, 1.9.0
• Fix Version/s: 1.9.0
• Component/s: Runtime / Metrics, Runtime / Network
• Labels: pull-request-available
• Assignee: Unassigned
• Reporter: Piotr Nowojski
• Created: 21/May/19 13:19
• Updated: 15/Oct/19 03:45
• Resolved: 14/Oct/19 10:30

Description

Currently inputQueueLength ignores LocalInputChannels (SingleInputGate#getNumberOfQueuedBuffers). This can can cause mistakes when looking for causes of back pressure (If task is back pressuring whole Flink job, but there is a data skew and only local input channels are being used).

Issue Links

• relates to: FLINK-12674 BoundedBlockingSubpartition#unsynchronizedGetNumberOfQueuedBuffers is not implemented
• links to: GitHub Pull Request #8559
• links to: GitHub Pull Request #9895