> Thanks for the heads up.  Do you know what happens if I set this value larger 
> than 5MB?  We will always be scanning the data, and always in large blocks.  
> I have yet to calculate the typical size of a single scan but imagine that it 
> will usually be larger than 1MB.

I never tried that, hard to tell, but always eager to hear about
others' experiences :)

>
> Also, is there any way to change the block size with data already in HBase?  
> Our current import process is very slow (preprocessing of the data) and we 
> don't have the resources to store the preprocessed data.

After altering the table, issue a major compaction on it and
everything will be re-written with the new block size.

J-D

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