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https://issues.apache.org/jira/browse/FLINK-9142?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Till Rohrmann updated FLINK-9142:
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Fix Version/s: 1.6.2
> 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
> Priority: Major
> Fix For: 1.7.0, 1.6.2
>
>
> 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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