Hypertable compression schemes

[Alex Dong]

I just put together a summary of hypertable compression schemes, how
to check the compression ratio, etc into a blog post. Would anyone
check it out and see if I've got anything wrong?

http://notes.alexdong.com/compression-in-hypertable

Alex

[Doug Judd]

Hi Alex,

Great post!  Let me clarify a few things.  Row prefix compression went into 0.9.3.2.  Also the row prefix compression is a step that happens at the block level before the normal compression is applied, so you get the benefit of both.  Also, CellStore blocks are stored in the block cache prefix compressed.  So not only does prefix compression save on disk space, but it also saves on block cache memory.  It effectively increases the size of the block cache.

Let me know when you're ready to publish and I'll be sure to tweet it.

- Doug

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