Allow custom file formats (aside from SequenceFileFormat) to pass args

[baconz]

I'm working on an AvroFileFormat, and I'd like to be able to pass it args -- this seemed like the least bad way to make it happen. Open to suggestions for other approaches.

[sritchie]

@sorenmacbeth, all you!

[sorenmacbeth]

Looks good at first glance to me. I'll give a more thorough going over soon. Thanks!

[cmerrick]

I ran into this same issue when trying to create a custom Avro file format that keeps track of the schema in args. +1 for this!

[kul]

:+1: for the well thought change. @baconz @cmerrick how do you get the arguments inside the serialize and deserialize methods in your implemented PailStructure? I am not able to figure this out.

[stanfea]

@baconz Did you get AvroFileFormat working?

I've made a pail structure that serializes and deserializes to from avro but it's stored in a SequenceFile and I'm getting poor performance from the pail tap this way. Thanks

[baconz]

@steanbacon we never did. More, or less abandoned this project.