Nico Kruber created FLINK-10141:
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Summary: Reduce lock contention introduced with 1.5
Key: FLINK-10141
URL: https://issues.apache.org/jira/browse/FLINK-10141
Project: Flink
Issue Type: Bug
Components: Network
Affects Versions: 1.6.0, 1.5.2, 1.7.0
Reporter: Nico Kruber
Assignee: Nico Kruber
With the changes around introducing credit-based flow control as well as the
low latency changes, unfortunately, we also introduced some lock contention on
{{RemoteInputChannel#bufferQueue}} and {{RemoteInputChannel#receivedBuffers}}
as well as some unnecessary reads of atomic booleans like
{{inputChannel.isReleased()}} in some scenarios.
This was observed as a high idle CPU load with no events in the stream but only
watermarks (every 500ms) and many slots on a single machine.
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