apache cassandra overview
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Apache Cassandraoverview
by Taras Tymoshchuk, software developer at ElifTech
IntroductionWhat is Apache Cassandra?
Apache Cassandra™ is a free
Distributed…High performance…Extremely scalable…Fault tolerant (i.e. no single point of failure)…
post-relational database solution. Cassandra can serve as both real-time datastore (the “system of record”) for online/transactional applications, and as a read-intensive database for business intelligence systems.
Top Use Cases● Internet of things applications – Cassandra is perfect for consuming lots of fast
incoming data from devices, sensors and similar mechanisms that exist in many different locations.
● Product catalogs and retail apps – Cassandra is the database of choice for many retailers that need durable shopping cart protection, fast product catalog input and lookups, and similar retail app support.
● User activity tracking and monitoring – many media and entertainment companies use Cassandra to track and monitor the activity of their users’ interactions with their movies, music, website and online applications.
● Messaging – Cassandra serves as the database backbone for numerous mobile phone and messaging providers’ applications.
● Social media analytics and recommendation engines – many online companies, websites, and social media providers use Cassandra to ingest, analyze, and provide analysis and recommendations to their customers.
Key Cassandra Features and Benefits
● Gigabyte to Petabyte scalability
● Linear performance
● No SPOF
● Easy replication / data distribution
● Multi datacenter and cloud capable
● No need for separate caching layer
● Tunable data consistency
● Flexible schema design
● Data compaction
● CQL language (like SQL)
● Support for key languages and platforms
● No need for special hardware or software
Architecture OverviewIn Cassandra, all nodes play an identical role; there is no concept of a master node.
Cassandra’s built-for-scale architecture means that it is capable of handling large amounts of data and thousands of concurrent users.
Cassandra’s architecture also means that, unlike other master-slave or sharded systems, it has no single point of failure and therefore is capable of offering true continuous availability and uptime.
CQLAstyanix / Hector API:
SliceQuery<string,string,string>query=...
query.set Key (“x”)
query.set Column Family (“y”)
CQL:
SELECT A FROM Y WHERE ID=”X”
Cassandra Data Objects
OverviewCassandra data model
COL1 VAL1 (TS1)COL2 VAL2 (TS2)KEY
Writing Data
Reading Data
Rake
● Bad implemented range scan, Cassandra can not currently transfer data;
● Compaction backing a request;
● Many settings made on the cluster level, type, storage strategy and etc.;
● Counters.
