Cassandra DB

• May 15, 2015
• Girikon

Main Part: Store huge datasets in “almost” SQL Key Features of Cassandra DB:

• Querying by key, or key range (secondary indices are also available)
• Data can have expiration (set on INSERT)
• Writes can be much faster than reads (when reads are disk-bound)
• Map/reduce possible with Apache Hadoop
• All nodes are similar, as opposed to Hadoop/HBase
• Very good and reliable cross-datacenter replication
• Distributed counter data type
• You can write triggers in Java

Best use: When you need to store data so huge that it doesn’t fit on server, but still want a friendly familiar interface to it. Examples: Web analytics, to count hits by hour, by browser, by IP, etc. Transaction logging. Data collection from huge sensor arrays. Regards, Alok