It uses this code:

https://github.com/twitter/chill/blob/develop/chill-scala/src/main/scala/com/twitter/chill/Externalizer.scala

which uses Kryo and Java Serialization to make the best effort to serialize
functions.

On Thu, Sep 22, 2016 at 9:04 AM Kostya Salomatin <saloma...@gmail.com>
wrote:

> Hey folks,
>
> I've got a question about serialization of internal Job vals (not the
> values passed in the pipe). Consider this simple example:
>
> class MyJob(args: Args) extends Job(args) {
>    val myFilter = new MyFilterClass(...)
>
>    val pipe = ... //read statement
>       .filter (myFilter.apply)
> }
>
> class MyFilterClass(some data required for filtering) { ... }
>
> My understanding is that myFilter will only be initialized once and then
> serialized and passed to all subsequent workers and if scalding does not
> know how to serialize this object the job will fail, is this correct?
> MyFilterClass is a regular scala class (not a case class) and I did not do
> anything special to make it serializable and the job runs fine. Does
> scalding know by default how to serialize all scala objects without any
> effort from me in the code or does it silently call constructor every time?
>
> Thanks,
> Kostya
>
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