ASF GitHub Bot commented on FLINK-7411:

GitHub user NicoK opened a pull request:


    [FLINK-7411][network] minor performance improvements in NettyMessage

    ## What is the purpose of the change
    This PR adds some (minor) performance improvements to `NettyMessage` which 
I came across: using a `switch` rather than multiple `if...ifelse...ifelse...` 
avoiding unneeded virtual method calls.
    ## Brief change log
    - use a switch rather than multiple if conditions
    - use static `readFrom` methods to create instances of the message sub types
    ## Verifying this change
    This change is already covered by existing tests, such as 
    ## Does this pull request potentially affect one of the following parts:
      - Dependencies (does it add or upgrade a dependency): (no)
      - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (no)
      - The serializers: (no)
      - The runtime per-record code paths (performance sensitive): (yes)
      - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes, if you consider 
network communication part of this)
    ## Documentation
      - Does this pull request introduce a new feature? (no)
      - If yes, how is the feature documented? (not applicable)

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/NicoK/flink flink-7411

Alternatively you can review and apply these changes as the patch at:


To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #4517
commit b33e036b43d00ddf564f105280894f6287dd3e92
Author: Nico Kruber <n...@data-artisans.com>
Date:   2017-08-07T15:38:36Z

    [FLINK-7411][network] minor (performance) improvements in NettyMessage
    * use a switch rather than multiple if conditions
    * use static `readFrom` methods to create instances of the message sub types


> minor performance improvements in NettyMessage
> ----------------------------------------------
>                 Key: FLINK-7411
>                 URL: https://issues.apache.org/jira/browse/FLINK-7411
>             Project: Flink
>          Issue Type: Improvement
>          Components: Network
>    Affects Versions: 1.4.0
>            Reporter: Nico Kruber
>            Assignee: Nico Kruber
>            Priority: Minor
> {{NettyMessage}} may be improved slightly performance-wise in these regards:
> - in {{NettyMessage.NettyMessageDecoder#decode()}}: instead of having 
> multiple if-elseif-... use a switch to cycle through the message ID
> - use a static {{NettyMessage}} subtype {{readFrom(ByteBuf buffer)}} - we do 
> not really need to have a virtual function here

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