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dc=DC1 | dc=DC1 | ||
rack=RAC1 | rack=RAC1 | ||
</pre> | |||
On both nodes delete file ''/etc/cassandra/cassandra-topology.properties'': | |||
<pre> | |||
rm -f /etc/cassandra/cassandra-topology.properties | |||
</pre> | </pre> | ||
| Line 64: | Line 69: | ||
<pre> | <pre> | ||
$ nodetool status | $ nodetool status | ||
Datacenter: DC1 | |||
=============== | |||
Status=Up/Down | |||
|/ State=Normal/Leaving/Joining/Moving | |||
-- Address Load Tokens Owns (effective) Host ID Rack | |||
UN 10.0.0.1 151.33 KiB 256 100.0% 80235601-9725-4da2-8e50-7b609cbb54d9 RAC1 | |||
UN 10.0.0.1 151.17 KiB 256 100.0% 2310ac52-456f-426b-87b1-56eefa376338 RAC1 | |||
</pre> | </pre> | ||
{{admon/note|Note:|If in any reason you previously started Apache Cassandra or you don't have same values in ''Datacenter'' and column ''Rack'' of nodetool status output, your '''nodes probably won't find each other''', to fix this, stop cassandra and delete data directory ''rm -rf /var/lib/cassandra/*''. '''(This will cause data loss if you have already data in database)'''}} | |||
Latest revision as of 15:59, 16 May 2018
This page contains example cluster setup for Apache Cassandra.
2-node Cassandra cluster
The Cassandra main configuration file /etc/cassandra/cassandra.yaml needs to be edited to setup the cluster. The options that you have to modify are:
| Option | Description |
|---|---|
| cluster_name | Name of your cluster. Must be same on all nodes. |
| num_tokens | Number of virtual nodes within a Cassandra instance. This is used to partition the data and spread the data throughout the cluster. The recommended value is 256. |
| seeds | Comma-delimited list of the IP address of each node in the cluster. |
| listen_address | The IP address or hostname that Cassandra binds to for connecting to other Cassandra nodes. It defaults to localhost and needs to be changed to the IP address of the node. |
| rpc_address | The listen address for client connections (CQL protocol). |
| endpoint_snitch | Set to a class that implements the IEndpointSnitch. Cassandra uses snitches for locating nodes and routing requests. The default one is SimpleSnitch but we will change to GossipingPropertyFileSnitch which is more suitable for production environments. |
| auto_bootstrap | This parameter is not present in the configuration file, so it has to be added and set to false. It makes new (non-seed) nodes automatically migrate the right data to themselves. |
Node 1 with IP address 10.0.0.1 edit/add options to /etc/cassandra/cassandra.yaml:
num_tokens: 256
seed_provider:
- class_name: org.apache.cassandra.locator.SimpleSeedProvider
parameters:
- seeds: 10.0.0.1, 10.0.0.2
listen_address: 10.0.0.1
rpc_address: 10.0.0.1
endpoint_snitch: GossipingPropertyFileSnitch
auto_bootstrap: false
Node 2 with IP address 10.0.0.2 edit/add options to /etc/cassandra/cassandra.yaml:
num_tokens: 256
seed_provider:
- class_name: org.apache.cassandra.locator.SimpleSeedProvider
parameters:
- seeds: 10.0.0.1, 10.0.0.2
listen_address: 10.0.0.2
rpc_address: 10.0.0.2
endpoint_snitch: GossipingPropertyFileSnitch
auto_bootstrap: false
Note:
If you use firewall, remember to open ports.
If you use firewall, remember to open ports.
On both nodes create file /etc/cassandra/cassandra-rackdc.properties:
dc=DC1 rack=RAC1
On both nodes delete file /etc/cassandra/cassandra-topology.properties:
rm -f /etc/cassandra/cassandra-topology.properties
Now you can start cluster, on both nodes start cassandra:
systemctl start cassandra
You should see cluster status and joined nodes with client tools:
$ nodetool status Datacenter: DC1 =============== Status=Up/Down |/ State=Normal/Leaving/Joining/Moving -- Address Load Tokens Owns (effective) Host ID Rack UN 10.0.0.1 151.33 KiB 256 100.0% 80235601-9725-4da2-8e50-7b609cbb54d9 RAC1 UN 10.0.0.1 151.17 KiB 256 100.0% 2310ac52-456f-426b-87b1-56eefa376338 RAC1
Note:
If in any reason you previously started Apache Cassandra or you don't have same values in Datacenter and column Rack of nodetool status output, your nodes probably won't find each other, to fix this, stop cassandra and delete data directory rm -rf /var/lib/cassandra/*. (This will cause data loss if you have already data in database)
If in any reason you previously started Apache Cassandra or you don't have same values in Datacenter and column Rack of nodetool status output, your nodes probably won't find each other, to fix this, stop cassandra and delete data directory rm -rf /var/lib/cassandra/*. (This will cause data loss if you have already data in database)