MongoDB

Updated 2,828 Days AgoPublic

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Currently CDRTool uses OpenSIPS radius client/ FreeRadius server/ MySQL database chain. This chain has weaknesses and scalability drawbacks, too many to mention.

Based on this analysis, MongoDB is a good candidate to replace the whole chain with a more scalable and elegant solution.

• Scales horizontally with the amount of hardware
• Almost zero configuration to install and run on Debbian, a few binaries only
• All works as one would expect a database, well documented by the makers
• Easy to learn and use (about two days)
• Multiple collections per database, equivalent to table in SQL
• Document oriented, a document is equivalent to a row in SQL schema
• Documents can have a different structure, unlike SQL schemas that have fixed columns
• Documents are JSONs. Can be imported and exported as such using cli tools. Backup/restore is dead easy
• Query language is dead simple using array/dictionaries
• Clever pipelines of processing on database server similar to UNIX pipes (version > 2.2)
• All CDRTool SQL queries equivalent were possible (with latest 2.2 server version and 1.3 client version)
• Multiple nodes with automatic replication, nothing to repair, does not conflict
• New nodes can be added or removed with a simple command, data replicated on the fly without locking
• One primary node elected by nodes, is the entity responsable for writing data
• Connected clients are aware of the primary selection and always write to elected primary
• Writes can be done with or without confirmation of committing to disc
• Clients can connect automatically to closest server RTT-wise
• Read queries can be targeted to slaves located in tagged data centers
• No need to create tables in advance, all is created on the fly (e.g. radacct tables)
• Data can expire automatically, no need to manually purge old logs (e.g. siptrace table)
• Clients available for every programming language
• Clients automatically failover
• Client can discover the whole cluster set by connecting to any available node
• Supports TLS transport for encrypted client to server connections
• Supports authentication
• Self-learning DNS can be used to discover nodes

Minuses

• Does not support the equivalent of SQL JOIN between tables. The need for joins can be eliminated by chosen data model