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From Terje Marthinussen <>
Subject Re: repair and amount of transfers
Date Tue, 14 Jun 2011 09:50:07 GMT

I just found Cassandra-2698 (I thought I had seen something about this)...

I guess that means I have too see if I can find time to investigate if I
have a reproducible case?


On Tue, Jun 14, 2011 at 4:21 PM, Terje Marthinussen <
> wrote:

> Hi,
> I have been testing repairs a bit in different ways on 0.8.0 and I am
> curious on what to really expect in terms of data transferred.
> I would expect my data to be fairly consistent in this case from the start.
> More than a billion supercolumns, but there was no errors in feed and we
> have seen minimal amounts of read repair going on while doing a complete
> scan of the data for consistency checking. As such, I would also expect
> repair to finish reasonably fast.
> On some nodes, it finishes in a couple of hours, but other nodes it is
> taking more than 12 hours and I see some 65GB of data streamed to the node
> which surprises me as I am pretty sure that it is not that out of sync.
> Not sure how much the merkle trees are actually reducing what needs to be
> streamed though.
> What should we expect to see if this works?
> Regards,
> Terje

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