Cassandra
satya - 1/6/2019, 2:04:07 PM
Cassandra architecture
Cassandra architecture
satya - 1/6/2019, 2:06:05 PM
An artcile from Dzone on cassandra architecture
satya - 1/6/2019, 2:08:13 PM
Key elements
On a cluster of nodes
distributed
Large volumes of data
High availability
High write throughput
High read throughput
No master nodes
No single point of failure
satya - 1/6/2019, 2:08:59 PM
How does cassandra partitions its data?
How does cassandra partitions its data?
satya - 1/6/2019, 2:11:37 PM
writes in cassandra
satya - 1/6/2019, 2:15:37 PM
How does cassandra partitions data among its cluster of nodes
How does cassandra partitions data among its cluster of nodes
Search for: How does cassandra partitions data among its cluster of nodes
satya - 1/6/2019, 2:17:29 PM
Docs on data replication of cassandra
satya - 1/6/2019, 2:20:50 PM
Briefly
A sequentially written commit log on each node captures write activity to ensure data durability. Data is then indexed and written to an in-memory structure, called a memtable, which resembles a write-back cache. Each time the memory structure is full, the data is written to disk in an SSTables data file. All writes are automatically partitioned and replicated throughout the cluster. Cassandra periodically consolidates SSTables using a process called compaction, discarding obsolete data marked for deletion with a tombstone. To ensure all data across the cluster stays consistent, various repair mechanisms are employed.
satya - 1/6/2019, 2:36:40 PM
Partitioning of data on multiple nodes based on a key is explained here
Partitioning of data on multiple nodes based on a key is explained here
satya - 1/6/2019, 2:38:13 PM
Example
satya - 1/7/2019, 1:29:09 PM
cassandra replicas data center cluster
cassandra replicas data center cluster
satya - 1/7/2019, 1:30:18 PM
Partitioning vs replication in Cassandra
Partitioning vs replication in Cassandra
satya - 1/7/2019, 1:33:46 PM
What are consistency levels in Cassandra: Local_Quorum
What are consistency levels in Cassandra: Local_Quorum
Search for: What are consistency levels in Cassandra: Local_Quorum
satya - 1/7/2019, 1:34:23 PM
what are key spaces in cassandra?
what are key spaces in cassandra?
satya - 1/7/2019, 1:36:51 PM
Briefly
A Cluster is a collection of Data Centers.
A Data Center is a collection of Racks.
A Rack is a collection of Servers.
A Server contains 256 virtual nodes (or vnodes) by default.
A vnode is the data storage layer within a server.
satya - 1/7/2019, 1:42:18 PM
How does cassandra replicate data across data centers?
How does cassandra replicate data across data centers?
Search for: How does cassandra replicate data across data centers?
satya - 1/7/2019, 2:07:31 PM
Setting up multiple data centers for cassandra
Setting up multiple data centers for cassandra
satya - 1/7/2019, 2:11:47 PM
This articles clarifies a few things
satya - 1/7/2019, 2:12:08 PM
Brief
If you have two data-centers -- you basically have complete data in each data-center. And if you have set replication factor, say, 2 for each data-center -- this means each data-center will have 2 copies of the data.
satya - 1/7/2019, 2:16:19 PM
what is a seed node in cassandra?
what is a seed node in cassandra?
satya - 1/7/2019, 2:18:35 PM
What are snitches in cassandra?
What are snitches in cassandra?
satya - 1/7/2019, 2:19:06 PM
Snitch
A snitch determines which datacenters and racks nodes belong to. They inform Cassandra about the network topology so that requests are routed efficiently and allows Cassandra to distribute replicas by grouping machines into datacenters and racks. Specifically, the replication strategy places the replicas based on the information provided by the new snitch. All nodes must return to the same rack and datacenter. Cassandra does its best not to have more than one replica on the same rack (which is not necessarily a physical location).
satya - 1/7/2019, 2:36:42 PM
SimpleStrategy and Network topology Strategy differences
SimpleStrategy and Network topology Strategy differences
Search for: SimpleStrategy and Network topology Strategy differences
satya - 1/7/2019, 2:40:36 PM
A good read on cassandra architecture from an external perspective
A good read on cassandra architecture from an external perspective
satya - 1/7/2019, 2:47:06 PM
This seem like a down to earth article on replication
satya - 1/7/2019, 2:54:45 PM
Example of topology
