Talk on the Cassandra Cluster Manager, ccm

1. Intro to CCM
Chris Lohfink

2. CCM
A script/library to create, launch and remove an
Apache Cassandra cluster on localhost.
The goal of ccm and ccmlib is to make it easy to
create, manage and destroy a small Cassandra
cluster on a local box. It is meant for testing a
Cassandra cluster.
https://github.com/pcmanus/ccm

3. Useful for
 Cassandra without installing
 Testing failure scenarios
 Testing Upgrades
 Development with multiple nodes/versions
without the hardware
 Version migrations
 Integration testing
 Python dtests
 Java CCM Bridge

4. Not useful for
 Production
 Stress testing

5. Alternatives
 Docker
 Vagrant
 VMs

6. Create a cluster
clohfink-rmbp:~ clohfink$ ccm create -n 3 -v 1.2.19 cassandra1-2-19
Downloading {redacted} to {redacted}, (10.958MB)
6602752 [57.47%]

7. Create a cluster
clohfink-rmbp:~ clohfink$ ccm create -n 3 -v 1.2.19 cassandra1-2-19
Downloading {redacted} to {redacted}, (10.958MB)
11489812 [100.00%]
Extracting {redacted} as version 1.2.19 ...
Compiling Cassandra 1.2.19 ...
Current cluster is now: cassandra1-2-19
clohfink-rmbp:~ clohfink$

8. Create a cluster
clohfink-rmbp:~ clohfink$ ccm create -n 3 -v 1.2.19 cassandra1-2-19
Downloading {redacted} to {redacted}, (10.958MB)
11489812 [100.00%]
Extracting {redacted} as version 1.2.19 ...
Compiling Cassandra 1.2.19 ...
Current cluster is now: cassandra1-2-19
clohfink-rmbp:~ clohfink$ ccm status
Cluster: 'cassandra1-2-19'
--------------------------
node1: DOWN (Not initialized)
node3: DOWN (Not initialized)
node2: DOWN (Not initialized)
clohfink-rmbp:~ clohfink$

9. Start the cluster
Compiling Cassandra 1.2.19 ...
Current cluster is now: cassandra1-2-19
clohfink-rmbp:~ clohfink$ ccm status
Cluster: 'cassandra1-2-19'
--------------------------
node1: DOWN (Not initialized)
node3: DOWN (Not initialized)
node2: DOWN (Not initialized)
clohfink-rmbp:~ clohfink$ ccm start
clohfink-rmbp:~ clohfink$ ccm status
Cluster: 'cassandra1-2-19'
--------------------------
node1: UP
node3: UP
node2: UP
clohfink-rmbp:~ clohfink$

10. Replication Factor Example
clohfink-rmbp:~ clohfink$ ccm node1 cqlsh
Connected to cassandra1-2-19 at 127.0.0.1:9160.
[cqlsh 3.1.8 | Cassandra 1.2.19-SNAPSHOT ...]
Use HELP for help.
cqlsh>

11. Replication Factor Example
clohfink-rmbp:~ clohfink$ ccm node1 cqlsh
Connected to cassandra1-2-19 at 127.0.0.1:9160.
[cqlsh 3.1.8 | Cassandra 1.2.19-SNAPSHOT ...]
Use HELP for help.
cqlsh> CREATE KEYSPACE mspdemo WITH replication = {'class': 'SimpleStrategy',
'replication_factor' : 2};

12. Replication Factor Example
clohfink-rmbp:~ clohfink$ ccm node1 cqlsh
Connected to cassandra1-2-19 at 127.0.0.1:9160.
[cqlsh 3.1.8 | Cassandra 1.2.19-SNAPSHOT ...]
Use HELP for help.
cqlsh> CREATE KEYSPACE mspdemo WITH replication = {'class': 'SimpleStrategy',
'replication_factor' : 2};
cqlsh> use mspdemo;
cqlsh:mspdemo> CREATE TABLE users (name text, here boolean, PRIMARY KEY
(name));

13. Replication Factor Example
clohfink-rmbp:~ clohfink$ ccm node1 cqlsh
Connected to cassandra1-2-19 at 127.0.0.1:9160.
[cqlsh 3.1.8 | Cassandra 1.2.19-SNAPSHOT ...]
Use HELP for help.
cqlsh> CREATE KEYSPACE mspdemo WITH replication = {'class': 'SimpleStrategy',
'replication_factor' : 2};
cqlsh> use mspdemo;
cqlsh:mspdemo> CREATE TABLE users (name text, here boolean, PRIMARY KEY
(name));
cqlsh:mspdemo> INSERT INTO users (name, here) VALUES ('chris', true);
cqlsh:mspdemo> exit;
clohfink-rmbp:~ clohfink$ ccm flush

14. Replication Factor Example
clohfink-rmbp:~ clohfink$ ccm node1 cqlsh
Connected to cassandra1-2-19 at 127.0.0.1:9160.
[cqlsh 3.1.8 | Cassandra 1.2.19-SNAPSHOT ...]
Use HELP for help.
cqlsh> CREATE KEYSPACE mspdemo WITH replication = {'class': 'SimpleStrategy',
'replication_factor' : 2};
cqlsh> use mspdemo;
cqlsh:mspdemo> CREATE TABLE users (name text, here boolean, PRIMARY KEY
(name));
cqlsh:mspdemo> INSERT INTO users (name, here) VALUES ('chris', true);
cqlsh:mspdemo> exit;
clohfink-rmbp:~ clohfink$ ccm flush
clohfink-rmbp:~ clohfink$ ccm node1 json -k mspdemo -c users test;cat test
running
[’.../node1/data/mspdemo/users/mspdemo-users-jb-1-Data.db']
-- mspdemo-users-jb-1-Data.db -----
[
{"key": "6368726973","columns": [["","",14...000], ["here","true",14...000]]}
]

15. Replication Factor Example
cqlsh:mspdemo> INSERT INTO users (name, here) VALUES ('chris', true);
cqlsh:mspdemo> exit;
clohfink-rmbp:~ clohfink$ ccm flush
clohfink-rmbp:~ clohfink$ ccm node1 json -k mspdemo -c users test;cat test
running
[’.../node1/data/mspdemo/users/mspdemo-users-jb-1-Data.db']
-- mspdemo-users-jb-1-Data.db -----
[
{"key": "6368726973","columns": [["","",14...000], ["here","true",14...000]]}
]
clohfink-rmbp:~ clohfink$ ccm node2 json -k mspdemo -c users test;cat test
running
[’.../node2/data/mspdemo/users/mspdemo-users-jb-1-Data.db']
-- mspdemo-users-jb-1-Data.db -----
[
{"key": "6368726973","columns": [["","",14...000], ["here","true",14...000]]}
]
clohfink-rmbp:~ clohfink$ ccm node3 json -k mspdemo –c users test;cat test
running
[]

16. Multiple Clusters
clohfink-rmbp:~ clohfink$ ccm list
cassandra1-2-19
cassandra2-0-11
*cassandra2-1-2
DSE_Cluster
Solr_Cluster
clohfink-rmbp:~ clohfink$ ccm switch cassandra1-2-191
9

17. CCM Commands
Cluster Node
Create Show Scrub
Add Show Log Shuffle
Populate Tail Log SSTableSplit
List Set Log cli
Switch Start json
Status Stop cqlsh
Remove Ring decomission
Clear Flush Update config
Start Compact Stress
Stop Drain nodetool
Flush Cleanup dsetool
+ more Repair + DSE stuff

18. More
 http://www.datastax.com/dev/blog/ccm-
a-development-tool-for-creating-local-
cassandra-clusters
 https://github.com/pcmanus/ccm