Introduction - Cassandra DB - Features - Discussion

NoSQL Discussion
Features and Benefits of Cassandra DB
Data Distribution - Peer-to-Peer
Data replication strategies
Scalability implementation
Data-Center fault-tolerance
Various features
Explore Cassandra Cluster Topology (CCT)


Single-Node - Implementation

Identify and obtain sources
Prep cluster nodes with Java environments
Ensure cross-platform support
Peruse configuration hierarchy
Tweak initial settings - ante-cluster invocation
Identify key network sockets
Start instance of Cassandra
Evaluate footprint
Evaluate results


Cassandra CLI

Discuss applicability - Legacy support - et cetera
Reveal cluster details using CLI
Define sample key space
Discuss data-types supported
Set | Get | Delete simple records
Evaluate data representation
Drop key space accordingly
Evaluate results


Cassandra Query Language (CQL) Client

Contrast with Legacy Cassandra CLI client
Reveal cluster details via CQL
Create | Drop key spaces
Create Column Families (CF)
Populate CF with rudimentary values for general usage
Query CF using standard CQL lingo
Explore Indices
Update data as needed
[Dis]Connect as needed
Evaluate environment and prepare for usage


Multi-Node - Cluster - Configuration - Deployment

Highlight benefits of distributed | peer-to-peer environment
Identify other nodes for inclusion
Discuss data replication strategies
Discuss tokenizationa and virtual nodes support
Peruse and update primary Cassandra configuration for multi-node support
Restart services and confirm data-availability
Introduce new nodes to Cassandra cluster
Query data accordingly
Update data replication to target an ideal number of nodes
Confirm availability of data across nodes
Prep configuration for other nodes
Distribute configuration using parallel SSH (pssh) as needed
Add remaining nodes to cluster
Evaluate current configuration
Fail nodes arbitrarily and confirm data-survival


Cassandra Node Management

Discuss available tools: Commercial | Open Source
Expose Cassandra Cluster configuration
Reveal cluster network details
Abbreviate cluster data and evaluate
Decommission node as desired for hypothetical scenario
Discuss various Cassandra protocols


Consistency Levels - Affirmatives | Negatives

Highlight default configuration
Contrast various approaches with respect to risk-tolerance
Discuss tunable consistency levels
Set Client Read | Write consistency levels
Evaluate data access post-consistency tweak
Repair data consistency across nodes
Confirm QUORUM-level consistency on ALL nodes of cluster
Evaluate results


Node Issues

Introduce Hypotheticals
Identify current data repositories
Fail redundant nodes and access data
Vary consistency level to reflect shifts in cluster dynamics
Confirm data-accessibility
Discuss tradeoffs of relegated stance
Up replication of data to reflect current cluster description
Down ALL nodes responsible for data and evaluate
Recover accordingly
Discuss risks and evaluate


Multiple Data Centers (DCs) - Custom Replication

Discuss available algos
Define accurate topology map for Cassandra Cluster
Update cluster configuration and re-initialize the cluster
Define new - simple key space for multi-DC replication
Reveal current multi-DC topology
Ensure data are replicated accordingly
Update existing key space to support multiple DCs
Evaluate configuration


Data Snapshots - Restoration

Explore available tools
Discuss backup | restoration model
Snapshot single node and evaluate traces
Use 'pssh' to snapshot ALL nodes
Confirm existence of various snapshots on various nodes
Purposely remove data
Confirm cluster-wide updates reflecting lost data
Restore key space as needed
Confirm availability

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