Usage of ExplicitHashKey

Hi there,

I've tried to add a 3rd parameter to Put to make use of the ExplicitHashKey. Since I wanted a quick solution I left the normal PartitionKey untouched and called it with "0" My assumption was, that the ExplicitHashKey will be used if present. Unfortunately it doesn't seem to work since all messages go to the same shard eventhough I'm using the "StartingHashKey" of each of my shards.

I've forked it here: https://github.com/konstantinj/kinesis-producer

Maybe you have an idea why it doesn't work.

I want to use round robin for my partition keys because it never really distributes well using my actual data as keys.