Github user ericl commented on the pull request:
https://github.com/apache/spark/pull/12248#issuecomment-207506665
The main difference is that propagation is transparent to user code. For
example, this could be used to implement something like X-trace without
requiring manual instrumentation of closures
On Fri, Apr 8, 2016, 2:40 AM Sean Owen <notificati...@github.com> wrote:
> Backing up, how does this differ from using broadcast variables for data,
> or for simply sending small properties objects in a closure? does it need
> all this complexity of yet another mechanism?
>
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