report deviation of per-node num_keys vs avg num_keys, for each node, post parse
got a stack trace with this. I fixed the strata_samples to use the class labels, but that doesn't seem to be the issue?
https://0xdata.atlassian.net/browse/HEX-593
173-180
show % delta against avg key distribution post-parse
8 machines
Wrap a timeout-retry around TCP open calls

Handles case of receiver being overwhelmed & slow to respond.
Also increase send/recv buffer size to match the NIO ByteBuffer size.
print any message in h2o stdout with TCP as info (don't stop). .working on new test with many enums per col, with the netflix separators ..using the new parse hardwired separator= param
was playing with different col #s for GLM with rooz. passing separator= and other h2o parse params thru **kwargs in the higher level parse functions now.
NPE fix