Avoid formatting traceback on dask serialization (#2053)
Avoid formatting traceback on dask serialization (#2053)

When we pass through serialization families we often check Dask's
type-based serialization first.  Often this fails quickly because we can
tell that we don't support the type.

Previously we would record the traceback whenever this happened (which
was all the time) and this would add a non-trivial amount of latency to
frequent small messages.

Now we avoid recording the tracebacks when the serialization family
raises a NotImplementedError.
mrocklin/distributed,blaze/distributed,dask/distributed,mrocklin/distributed,blaze/distributed,dask/distributed,mrocklin/distributed,dask/distributed,dask/distributed