RethinkDB JavaScript
RethinkDB JavaScript
  1. Accessing ReQL
    1. close
    2. connect
    3. EventEmitter (connection)
    4. noreplyWait
    5. r
    6. reconnect
    7. run
    8. server
    9. use
  2. Administration
    1. config
    2. grant
    3. rebalance
    4. reconfigure
    5. status
    6. wait
  3. Aggregation
    1. avg
    2. contains
    3. count
    4. distinct
    5. fold
    6. group
    7. max
    8. min
    9. reduce
    10. sum
    11. ungroup
  4. Control Structures
    1. args
    2. binary
    3. branch
    4. coerceTo
    5. default
    6. do
    7. error
    8. expr
    9. forEach
    10. http
    11. info
    12. js
    13. json
    14. range
    15. toJSON
    16. typeOf
    17. uuid
  5. Cursors
    1. close
    2. each
    3. eachAsync
    4. EventEmitter (cursor)
    5. next
    6. toArray
  6. Dates and Times
    1. date
    2. day
    3. dayOfWeek
    4. dayOfYear
    5. during
    6. epochTime
    7. hours
    8. inTimezone
    9. ISO8601
    10. minutes
    11. month
    12. now
    13. seconds
    14. time
    15. timeOfDay
    16. timezone
    17. toEpochTime
    18. toISO8601
    19. year
  7. Document Manipulation
    1. () (bracket)
    2. append
    3. changeAt
    4. deleteAt
    5. difference
    6. getField
    7. hasFields
    8. insertAt
    9. keys
    10. literal
    11. merge
    12. object
    13. pluck
    14. prepend
    15. row
    16. setDifference
    17. setInsert
    18. setIntersection
    19. setUnion
    20. spliceAt
    21. values
    22. without
  8. Geospatial
    1. circle
    2. distance
    3. fill
    4. geojson
    5. getIntersecting
    6. getNearest
    7. includes
    8. intersects
    9. line
    10. point
    11. polygon
    12. polygonSub
    13. toGeojson
  9. Guides: Administration
    1. Administration tools
    2. Backing up your data
    3. Current issues
    4. Failover
    5. Importing data
    6. Jobs
    7. Permissions and user accounts
    8. Scaling, sharding and replication
    9. Statistics
    10. System tables
    11. Third-party admin tools
    12. Version migration
  10. Guides: Deployment
    1. Command line options
    2. Configuration file settings
    3. Deploying with PaaS
    4. Securing your cluster
    5. Start on system startup
    6. Third-party deployment tools
  11. Guides: Getting started
    1. Install client drivers
    2. Install the server
    3. Start a RethinkDB server
    4. Thirty-second quickstart
  12. Guides: Integration
    1. Integrating Elasticsearch
    2. Integrating RabbitMQ
    3. Publish-subscribe
    4. RethinkDB and Rails
    5. Third-party libraries
    6. Writing drivers
  13. Guides: ReQL in practice
    1. Cookbook
    2. Data exploration
    3. Example projects
    4. Optimizing query performance
    5. SQL to ReQL cheat sheet
  14. Guides: RethinkDB architecture
    1. Architecture details
    2. Consistency guarantees
    3. Performance report
  15. Guides: The ReQL query language
    1. Accessing HTTP APIs
    2. Accessing nested fields
    3. Asynchronous connections
    4. Changefeeds
    5. Introduction to ReQL
    6. Map-reduce in RethinkDB
    7. ReQL error types
    8. Table joins in RethinkDB
    9. Ten-minute guide
    10. Using secondary indexes
  16. Guides: The RethinkDB data model
    1. Binary objects
    2. Dates and times
    3. Geospatial queries
    4. Modeling relationships
    5. ReQL data types
  17. Guides: Troubleshooting
    1. Crash recovery
    2. Memory requirements
    3. Troubleshooting FAQ
  18. Index
    1. index
  19. Joins
    1. eqJoin
    2. innerJoin
    3. outerJoin
    4. zip
  20. Manipulating Databases
    1. dbCreate
    2. dbDrop
    3. dbList
  21. Manipulating Tables
    1. changes
    2. indexCreate
    3. indexDrop
    4. indexList
    5. indexRename
    6. indexStatus
    7. indexWait
    8. tableCreate
    9. tableDrop
    10. tableList
  22. Math and Logic
    1. add
    2. and
    3. ceil
    4. div
    5. eq
    6. floor
    7. ge
    8. gt
    9. le
    10. lt
    11. mod
    12. mul
    13. ne
    14. not
    15. or
    16. random
    17. round
    18. sub
  23. Reference
    1. JavaScript ReQL command reference
  24. Selecting Data
    1. between
    2. db
    3. filter
    4. get
    5. getAll
    6. table
  25. String Manipulation
    1. downcase
    2. match
    3. split
    4. upcase
  26. Transformations
    1. concatMap
    2. isEmpty
    3. limit
    4. map
    5. nth
    6. offsetsOf
    7. orderBy
    8. sample
    9. skip
    10. slice
    11. union
    12. withFields
  27. Writing Data
    1. delete
    2. insert
    3. replace
    4. sync
    5. update
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Map-reduce in RethinkDB

Map-reduce in RethinkDB

Map-reduce is a way to summarize and run aggregation functions on large data sets, potentially stored across many servers, in an efficient fashion. It works by processing the data on each server in parallel and then combining those results into one set. It was originally designed by Google and later implemented in database systems such as Apache Hadoop and MongoDB.