Cassandra vs Galera Cluster: What are the differences?
What is Cassandra? A partitioned row store. Rows are organized into tables with a required primary key. Partitioning means that Cassandra can distribute your data across multiple machines in an application-transparent matter. Cassandra will automatically repartition as machines are added and removed from the cluster. Row store means that like relational databases, Cassandra organizes data by rows and columns. The Cassandra Query Language (CQL) is a close relative of SQL.
What is Galera Cluster? A Multi-Master Cluster based on synchronous replication for MySQL. It’s an easy-to-use, high-availability solution, which provides high system up-time, no data loss and scalability for future growth. You can Keep it up and running 24/7. Putting our expertise to use will help you avoid trial and error.
Cassandra and Galera Cluster can be categorized as "Databases" tools.
Cassandra and Galera Cluster are both open source tools. It seems that Cassandra with 5.34K GitHub stars and 2.36K forks on GitHub has more adoption than Galera Cluster with 279 GitHub stars and 118 GitHub forks.
Uber Technologies, Facebook, and Netflix are some of the popular companies that use Cassandra, whereas Galera Cluster is used by Broker Genius, Rolosync, and Stockopedia. Cassandra has a broader approval, being mentioned in 431 company stacks & 1388 developers stacks; compared to Galera Cluster, which is listed in 14 company stacks and 5 developer stacks.
What is Cassandra?
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Stitch is a wrapper around a Cassandra database. It has a web application that provides read-access to the counts through an HTTP API. The counts are written to Cassandra in two distinct ways, and it's possible to use either or both of them:
Real-time: For real-time updates, Stitch has a processor application that handles a stream of events coming from a broker and increments the appropriate counts in Cassandra.
Batch: The batch part is a MapReduce job running on Hadoop that reads event logs, calculates the overall totals, and bulk loads this into Cassandra.
Cassandra is our data management workhorse. It handles all our key-value services, supports time-series data storage and retrieval, securely stores all our audit trails, and backs our Datomic database.
While we experimented with Cassandra in the past, we are no longer using it. It is, however, open for consideration in future projects.
We are using Cassandra in a few of our apps. One of them is as a count service application to track the number of shares, clicks.. etc