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From Rahul Reddy <>
Subject Re: Cassandra copy command
Date Wed, 21 Aug 2019 10:57:21 GMT
Hi sefan,

I'm adding new DC3 to exiting cluster and see discripencies couple of
millions in Nodetool cfstats in new DC.

My table size is 50gb
I'm trying to run copy entire table.

Copy table to 'full_tablr.csv' with delimiter ',';

If I run above command from dc3. Does it get the data only from dc3?

On Wed, Aug 21, 2019, 6:46 AM Stefan Miklosovic <> wrote:

> Hi Rahul,
> what is your motivation behind this? Why do you want to make sure the
> count is same? What is the purpose of that? All you should care about
> is that Cassandra will return you right results. It was designed from
> the very bottom to do that for you, you should not be bothered too
> much about such discrepancies, they will be always there in general.
> But the important fact is that once queried, you can rest assured it
> is returned (and consequentially repaired if data not match) as they
> should.
> What copy command you are talking about precisely, why you cant use just
> repair?
> On Wed, 21 Aug 2019 at 12:14, Rahul Reddy <>
> wrote:
> >
> > Hello,
> >
> > I have 3 datacenters . Want to make sure record count is same in all
> dc's . If I run copy command node1 in dc1 does it get the data from only
> dc1? Nodetool cfstats I'm seeing discrepancies in partitions count is it
> because we didn't run cleanup after adding few nodes and remove them?. To
> rule out any discripencies I want to run copy command from 3 DC's and
> compare. Please let me know if copy command extracts data from the DC only
> I ran it from?
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