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From Paul Leddy <>
Subject Re: Keyspace Replication changes not synchronized after adding Datacenter
Date Wed, 15 Apr 2015 16:33:53 GMT

No, that is not expected at all, to run the alter statement in each DC. 
Yes, it indicates a larger problem, for sure.

Check that ports are open between all nodes, especially 7000, if I 
recall correctly. We use a simple telnet check.


On 04/13/2015 10:22 AM, Thunder Stumpges wrote:
> Hi guys,
> We have recently added two datacenters to our existing 2.0.6 cluster. 
> We followed the process here pretty much exactly:
> We are using GossipingPropertyFileSnitch and NetworkTopologyStrategy 
> across the board. All property files are identical in each of the 
> three datacenters, and we use two nodes from each DC in the seed list.
> However when we came to step 7.a. we ran the ALTER KEYSPACE command on 
> one of the new datacenters (to add it as a replica). This change was 
> reflected on the new datacenter where it ran as returned by DESCRIBE 
> KEYSPACE. However the change was NOT propagated to either of the other 
> two datacenters. We effectively had to run the ALTER KEYSPACE command 
> 3 times, one in each datacenter. Is this expected? I could find no 
> documentation stating that this needed to be done, nor any 
> documentation around how the system keyspace was kept in sync across 
> datacenters in general.
> If this is indicative of a larger problem with our installation, how 
> would we go about troubleshooting it?
> Thanks in advance!
> Thunder

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