How Digg migration to Cassandra from MYSQL
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  • Reads 8
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  • Parts 1
  • Time <5 mins
Tekslate
Ongoing, First published Nov 16, 2016
apachecassandracassandratrainingcassandratutorial
Today I'm gonna share my experience when I started with Apache Cassandra... If you consider the case study of Digg: How Digg migrated their friends+diggs data set to Cassandra from MYSQL, here is the explanation.

Digg implemented their new badges feature in Cassandra, a distributed, structured key-value store. Digg adopted a traditional vertically distributed master-slave configuration with MySQL, and investigated sharding (type of database partitionin) MySQL. In the case of the traditional architecture, Cassandra has a masterless "ring" which is easy to set up and to maintain.

Since it was necessary to strand data normalization and consistency to make these methodologies work. Digg adopted to comfortable with non-relational data stores. With the consideration of HBase, Voldemort, Cassandra, Hypertable, Tokyo Cabinet/Tyrant, and Dynomite, finally migrated on to Cassandra.
Every system has its own pros and cons, but Cassandra has a good blend of all. It offers Data Partitioning, Consistent Hashing, Data Replication, Eventual & Tunable Consistency, Gossip Protocol to discover nodes, Keyspace, Column & Row -oriented data storage, so you have a bit more structure than plain key/value stores. It operates in a distributed, highly available, Cluster/Ring. 
When an item is dugg, Digg asynchronously populates Cassandra. This operation fetches the list of followers of the digging user, and every column is inserted at once, atomically in each of their buckets, under a second.
In my upcoming posts, I will try to explain Cassandra architecture and other topics.
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In this book, you'll get a behind the scenes look at how your favorite characters were born, my creative process, and the dirty details never before revealed. Tex's Camp Q&A: Come sit by the fire and ask me whatever you'd like. We can roast marshmallows, tell scary stories, and hang out in the comments like a big, happy family. Gator's Backstage Pass: A place full of secrets. Learn the-sometimes embarrassing-details on how my wildest scenes came to life, facts about the characters, the process, and myself.

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