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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Small HintedHanoffManager improvement?
Date Tue, 22 Dec 2009 16:19:19 GMT
On Mon, Dec 21, 2009 at 12:46 PM, Ramzi Rabah <rrabah@playdom.com> wrote:
> It seems that we still send a row mutation even if the cf of the row
> is null.

It should never happen, and if it does it's harmless, so adding a
special case for it is counterproductive.

> On a different note, I have a few questions about HHOM design.
> HintedHandOffManager seems to send the whole CF for a key, even if the
> only thing that changed was a value in 1 single column.

Only the changed parts are written to hint nodes in the first place.

> And one last question about HHOM, since the node that is handling the
> Hint might not be (and is probably not) one of the replicas if I
> understood the code correctly, Will the data written to it ever be
> cleaned, if I issue a delete later on down the line?

Hinted data is removed by cleanup operations.

-Jonathan

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