Database Reference
In-Depth Information
Cassandra cluster scaling - adding a new
node
Cassandra scales very easily, and with zero downtime. This is one of the reasons why it is
chosen over many other contenders. The steps are pretty straightforward and simple:
1. You need to set up Cassandra on the nodes to be added. Don't start the Cassandra
process yet; first, follow these steps:
1. Update the seed nodes in
Cassandra.yaml
under
seed_provider
.
2. Make sure the
tmp
folders are clean.
3. Add
auto_bootstrap
to
Cassandra.yaml
and set it to
true
.
4. Update
cluster_name
in
Cassandra.yaml
.
5. Update
listen_address
/
broadcast_address
in
Cas-
sandra.yaml
.
2. Start all the new nodes one by one, pausing for at least 5 minutes between two con-
secutive starts.
3. Once the node is started, it will proclaim its share of data based on the token range
it owns and start streaming that in. This could be verified using the
nodetool-
netstat
command, as shown in the following code:
mydomain@my-cass1:/home/ubuntu$ /usr/local/cassandra/
apache- cassandra-1.1.6/bin/nodetool -h 10.3.12.29
netstats | grep - v 0%
Mode: JOINING
Not sending any streams.
Streaming from: /10.3.12.179
my_keyspace: /var/lib/cassandra/data/my_keyspace/mycf/
my_keyspace-my-hf- 461279-Data.db sections=1
progress=2382265999194/3079619547748 - 77%
Pool Name Active Pending
Completed
Commands n/a
0 33
Responses n/a 0
13575829
mydomain@my-cass1:/home/ubuntu$
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