Talk by Tom Wilkie at Cassandra London meetup

1. Cassandra
Performance
Past, Present & Future
Tom Wilkie, Founder
Acunu Ltd

2. A Busy Year
11 Jan : Cassandra 0.7.0
3 Jun: Cassandra 0.8.0
18 Oct: Cassandra 1.0.0

3. 11 Jan : Cassandra 0.7.0
• Dynamic endpoint snitch
• Row cache improvements
• Secondary indexes
3 Jun: Cassandra 0.8.0
18 Oct: Cassandra 1.0.0

4. 11 Jan : Cassandra 0.7.0
3 Jun: Cassandra 0.8.0
• Counters
• CQL
18 Oct: Cassandra 1.0.0

5. 11 Jan : Cassandra 0.7.0
3 Jun: Cassandra 0.8.0
18 Oct: Cassandra 1.0.0
• Compression
• Off heap caches, arena allocations etc
• LevelDB-style compactions

6. Benchmarking

7. Read the fine print
24GB of memory ... a 300GB disk
...key size of 13 bytes and
data size of 1108 bytes.
... 96 nodes storing 2.1 billion records
~350k inserts / sec
http://www.oracle.com/technetwork/database/nosqldb/learnmore/nosql-database-498041.pdf

8. “Read/write performance on a single four-core machine.
One million inserts followed by one million updates”
http://www.datastax.com/dev/blog/whats-new-in-cassandra-1-0-performance

9. 1 x Quad core Xeon E5620
Machine 24GB RAM, 8x1TB Disks
1 commit log, 7 in RAID 10
Keys: 8 byte,Values: 10 bytes
Random key distribution
Workload 10 million Inserts,
Random Point Gets,
Range Queries

10. Cassandra Performance Evolution
90,000
80,000
70,000
60,000
50,000
40,000
30,000
20,000
10,000
0
Inserts Point Gets Range Queries
0.7.9
0.8.7
1.0.2

11. 1 x Quad core Xeon E5620
Machine 24GB RAM, 8x1TB Disks
1 commit log, 7 in RAID 10
Keys: 8 byte,Values: 100 bytes
Random key distribution
Workload 300 million Inserts,
Random Point Gets,
Range Queries

12. Inserts/s
Time / hours

13. Effect of Compression and Leveled Compaction
60,000 200
50,000
160
40,000
120
30,000
80
20,000
40
10,000
0 0
Inserts Point Gets
1.0.2
w/ Compression
w/ Leveled Compaction

14. Effect of Compression and Leveled Compaction
60,000 500
50,000
400
40,000
300
30,000
200
20,000
100
10,000
0 0
1.0.2 Inserts Point Gets Range Queries
w/ Compression
w/ Leveled Compaction
Acunu

15. Future

16. Questions?
Tom Wilkie
@tom_wilkie
tom@acunu.com
http://bitbucket.org/acunu
http://github.com/acunu
http://www.acunu.com/download
http://www.acunu.com/insights