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From "Nico Kruber (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-9142) Lower the minimum number of buffers for incoming channels to 1
Date Thu, 05 Apr 2018 13:33:00 GMT
Nico Kruber created FLINK-9142:

             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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