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From Pradeep Chhetri <>
Subject Re: Switching Snitch
Date Sun, 26 Aug 2018 18:14:05 GMT
Hello everyone,

Since i didn't hear from anyone, just want to describe my question again:

Am i correct in understanding that i need to do following steps to migrate
data from SimpleSnitch to GPFS changing datacenter name and rack name to
AWS region and Availability zone respectively

1) Update the rack and datacenter fields in
file and rolling restart cassandra with this flag
"-Dcassandra.ignore_dc=true -Dcassandra.ignore_rack=true"

2) Run nodetool repair --sequential and nodetool cleanup.

3) Rolling restart cassandra removing the flag  "-Dcassandra.ignore_dc=true


On Thu, Aug 23, 2018 at 10:53 PM, Pradeep Chhetri <>

> Hello,
> I am currently running a 3.11.2 cluster in SimpleSnitch hence the
> datacenter is datacenter1 and rack is rack1 for all nodes on AWS. I want to
> switch to GPFS by changing the rack name to the availability-zone name and
> datacenter name to region name.
> When I try to restart individual nodes by changing those values, it failed
> to start throwing the error about dc and rack name mismatch but gives me an
> option to set ignore_dc and ignore_rack to true to bypass it.
> I am not sure if it is safe to set those two flags to true and if there is
> any drawback now or in future when i add a new datacenter to the cluster. I
> went through the documentation on Switching Snitches but didn't get much
> explanation.
> Regards,
> Pradeep

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