Object persistence API for Cassandra.
As explained in How does Cassandra store data? – A simple explanation Cassandra uses partitioning key (the first part of primary key) to store a record into a partition on a node. Prior to version 1.2, one server = one node. That is each machine was assigned to a range of values, so that the entire cluster covered … Continue reading Cassandra node vs partition: A simple explanation
Cassandra primary key (a unique identifier for a row) is made up of two parts - 1) one or more partitioning columns and 2) zero or more clustering columns. To search a table without any indexes, all partitioning columns must be provided to avoid error message: Cannot execute this query as it might involve data filtering … Continue reading Cassandra Primary Key = ((Partitioning Key), Clustering Key): A simple explanation
Every time a record is inserted into Cassandra - it follows the write-path as per the diagram above. First, the record is written to a commit log (on disk). All records irrespective of schema tables are written to the commit log. The commit log enables recovery of memtable in case of hardware failure. Second, the … Continue reading How does Cassandra store data? – A simple explanation
How to migrate SQL app to Cassandra