Podcast
Questions and Answers
What is the primary characteristic of Cassandra, a NoSQL database, that provides both technical and business advantages?
What is the primary characteristic of Cassandra, a NoSQL database, that provides both technical and business advantages?
What is a major limitation of traditional SQL databases that Cassandra and other NoSQL databases have addressed?
What is a major limitation of traditional SQL databases that Cassandra and other NoSQL databases have addressed?
What is the primary reason why Cassandra is well-suited for handling Big Data?
What is the primary reason why Cassandra is well-suited for handling Big Data?
What is the benefit of running Cassandra on multiple machines?
What is the benefit of running Cassandra on multiple machines?
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What is the main advantage of Cassandra's flexible approach to schema definition?
What is the main advantage of Cassandra's flexible approach to schema definition?
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What is the primary reason why running Cassandra on a single node is not recommended?
What is the primary reason why running Cassandra on a single node is not recommended?
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What is a node in Cassandra?
What is a node in Cassandra?
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What is the main advantage of Cassandra's architecture?
What is the main advantage of Cassandra's architecture?
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How does Cassandra distribute data among nodes?
How does Cassandra distribute data among nodes?
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What is the role of the coordinator in Cassandra?
What is the role of the coordinator in Cassandra?
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What is the purpose of gossip in Cassandra?
What is the purpose of gossip in Cassandra?
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What happens when you need to increase Cassandra's capacity?
What happens when you need to increase Cassandra's capacity?
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Study Notes
Cassandra and NoSQL Databases
- NoSQL databases are lightweight, open-source, non-relational, and distributed, featuring horizontal scalability, flexible schema definition, and rapid ad-hoc data organization and analysis.
- Cassandra is a NoSQL distributed database, addressing the constraints of traditional data management technologies, such as SQL databases.
Distributed Architecture
- Cassandra's distributed architecture enables easy scaling, prevents data loss from hardware failure, and provides technical power.
- Distributed means running on multiple machines, appearing as a unified whole to users.
- Running Cassandra on multiple machines is essential to get the maximum benefit, with each node representing a single instance of Cassandra.
Node Communication and Architecture
- Nodes communicate with each other through the gossip protocol, a process of computer peer-to-peer communication.
- Cassandra has a masterless architecture, where any node can provide the same functionality as any other node, contributing to its robustness and resilience.
Clustering and Datacenters
- Multiple nodes can be organized into a cluster, or "ring", with the possibility of having multiple datacenters.
- Clustering allows for dynamic scaling, using off-the-shelf hardware, with no downtime.
Scalability and Performance
- Cassandra enables developers to scale their databases dynamically, using commodity hardware, with no downtime.
- Horizontal scalability (scale-out) allows for easy increase in data management capacity, simply by adding more nodes.
- Linear scalability applies indefinitely, with the flexibility to scale back if needed.
Data Distribution and Partitioning
- Data is automatically distributed across the cluster, with positive performance consequences.
- Cassandra distributes data using partitions, with each node owning a particular set of tokens.
- The partition key determines data locality, with a hash function applied to the partition key to determine the node responsible for storing the data.
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Description
Learn about Cassandra, a NoSQL distributed database that offers horizontal scalability, flexible schema definition, and rapid data analysis. Discover its strengths and importance in the era of Big Data.
