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From shalom sagges <shalomsag...@gmail.com>
Subject Adding a New Node
Date Tue, 24 Oct 2017 07:13:34 GMT
Hi Everyone,

I have 2 DCs (v2.0.14) with the following topology.properties:

DC1:
xxx11=DC1:RAC1
xxx12=DC1:RAC1
xxx13=DC1:RAC1
xxx14=DC1:RAC1
xxx15=DC1:RAC1


DC2:
yyy11=DC2:RAC1
yyy12=DC2:RAC1
yyy13=DC2:RAC1
yyy14=DC2:RAC1
yyy15=DC2:RAC1


# default for unknown nodes
default=DC1:RAC1

Now let's say that I want to add a new node yyy16 to DC2, and I've added
yyy16 to the topology properties file only on that specific node.

What I saw is that during bootstrap, the new node is receiving data only
from DC2 nodes (which is what I want), but nodetool status on other nodes
shows that it was joining to DC1 (which is the default DC for unknown
nodes).

So I have a few questions on this matter:

1) What are the implications of such a bootstrap, where the joining node
actually gets data from nodes in the right DC, but all nodes see it in the
default DC when running nodetool status?

2) I know that I must change the topology.properties file on all nodes to
be the same. If I do that, do I need to perform a rolling restart on all of
the cluster before each bootstrap (which is a real pain for large clusters)?

3) Regarding the Snitch, the docs say that the recommended snitch in
Production is the GossipingPropertyFileSnitch with
cassandra-rackdc.properties file.
What's the difference between the GossipingPropertyFileSnitchand and the
PropertyFileSnitch?
I currently use PropertyFileSnitch and cassandra-topology.properties.


Thanks!

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