Hi Rolih,
 
> Before compression, the size of chunks is the same. But, I would like to know 
> if after
> compression chunks are the  same size ?

No, the size of the compressed chunks will generally be different for different
chunks (unless they contain the exact same data). In the worst case, the size
of a compressed chunk could be larger than the original chunk size.

> Secondly, I need to understand the issue about space allocation on 
> compression in parallel:

Compression is currently (!) not supported for parallel writes.
However, you can read compressed datasets in parallel.

Best, G.

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