an introduction to mongdb
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MongoDB
What is it ?
Features
Tools
Use with Hadoop
Hadoop Tools
MongoDB What is it ?
Document oriented NoSql database
BSON schema data format ( Binary JSON )
Released as open source / free
Can be used as a distributed database
Has load balancing
Has replication
Written in C++
Licensed via Apache
MongoDB Features
Queries
By field
By regular expression
User defined java script functions
By range
Indexes
Primary and secondary
Any document field
Replication
Master can replicate to multiple slaves
MongoDB Features
Load balancing
Data split across multple shards
DB scales using shards
New machines can be added to running database
Map reduce can be used for aggregation
File storage via GridFS
Load balanced file system
File system with replication
Functions available for file manipulation
MongoDB Tools
Mongo a db access shell and admin tool
Mongostat a status tool similar to vmstat
Mongotop top processes like Unix top command
Mongosniff low level traffic sniffing
Mongoimport import JSON, CSV, TSV plus others
Mongoexport export tool ( as import )
Mongodump dump database contents
Mongostore reload database dumps
MongoDB With Hadoop
Hadoop connector available from github
Allows Hadoop I/O
Compiles with SBT build tool
Supports Hadoop
0.20/0.20.x
1.0/1.0.x
1.1/1.1.x
0.21/0.21.x
CDH3
CDH4
MongoDB Attributes
The image on the left shows how Hadoop and its tools are used with MongoDB via a connector. The image on the right shows MongoDB attributes.
MongoDB Hadoop Tools
The Hadoop connector supports
Map Reduce
Pig
Hadoop streaming
Flume
Hive
Hive BSON file access
MongoDB can use HDFS for storage
MongoDB Architecture
A db server
has many databases
A database
Has many collections
A collection
Has many documents
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