title: Joining two large hdf5 files based on single column in python
body: <p>I'm trying to join two hdf5 files on the disk based on a single column and then perform some calculations. I guess I can use dask but it is slow for my task and would like to know if there are any other alternatives in h5py package or bcolz package that I use. </p>
  
  <p>TIA</p>