Nico Kruber created FLINK-9142:
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Summary: Lower the minimum number of buffers for incoming channels
to 1
Key: FLINK-9142
URL: https://issues.apache.org/jira/browse/FLINK-9142
Project: Flink
Issue Type: Sub-task
Components: Network
Affects Versions: 1.5.0, 1.6.0
Reporter: Nico Kruber
Fix For: 1.5.0
Even if we make the floating buffers optional, we still require
{{taskmanager.network.memory.buffers-per-channel}} number of (exclusive)
buffers per incoming channel with credit-based flow control while without, the
minimum was 1 and only the maximum number of buffers was influenced by this
parameter.
{{taskmanager.network.memory.buffers-per-channel}} is set to {{2}} by default
with the argumentation that this way we will have one buffer available for
netty to process while a worker thread is processing/deserializing the other
buffer. While this seems reasonable, it does increase our minimum requirements.
Instead, we could probably live with {{1}} exclusive buffer and up to
{{gate.getNumberOfInputChannels() * (networkBuffersPerChannel - 1) +
extraNetworkBuffersPerGate}} floating buffers. That way we will have the same
memory footprint as before with only slightly changed behaviour.
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