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From Rahul Reddy <rahulreddy1...@gmail.com>
Subject Re: Cassandra copy command
Date Wed, 21 Aug 2019 11:51:20 GMT
Yep I did run rebuild   on each new node

On Wed, Aug 21, 2019, 7:25 AM Stefan Miklosovic <
stefan.miklosovic@instaclustr.com> wrote:

> Hi Rahul,
>
> how did you add that dc3 to cluster? The rule of thumb here is to do
> rebuild from each node, for example like here
>
> https://docs.datastax.com/en/archived/cassandra/3.0/cassandra/operations/opsAddDCToCluster.html
>
> On Wed, 21 Aug 2019 at 12:57, Rahul Reddy <rahulreddy1234@gmail.com>
> wrote:
> >
> > 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 <
> stefan.miklosovic@instaclustr.com> 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 <rahulreddy1234@gmail.com>
> 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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