GitHub user NicoK opened a pull request:

    [FLINK-7412][network] optimise NettyMessage.TaskEventRequest#readFrom() to 
read from netty buffers directly

    ## What is the purpose of the change
    `NettyMessage.TaskEventRequest#readFrom()` had an outstanding TODO to read 
from the netty buffer directly, instead of copying to a `ByteBuffer` first and 
then deserializing the event.
    ## Brief change log
    - use `ByteBuf#nioBuffer()` to deserialize from a `ByteBuffer` instance 
wrapping netty's buffer contents 
    ## Verifying this change
    This change is already covered by existing tests, such as 
`NettyMessageSerializationTest` as well as many other tests, especially IT 
cases, involving network.
    ## 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 flink-7412

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 #4518
commit b33e036b43d00ddf564f105280894f6287dd3e92
Author: Nico Kruber <>
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

commit bce73af1b01793574d748e6536052ec6530360b0
Author: Nico Kruber <>
Date:   2017-08-07T16:12:28Z

    [FLINK-7412][network] optimise NettyMessage.TaskEventRequest#readFrom() to 
read from netty buffers directly


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