Simba is a distributed in-memory spatial analytics engine based on Apache Spark. It extends the Spark SQL engine across the system stack to support rich spatial queries and analytics through both SQL and the DataFrame API. Besides, Simba introduces native indexing support over RDDs in order to develop efficient spatial operators. It also extends Spark SQL's query optimizer with spatial-aware and cost-based optimizations to make the best use of existing indexes and statistics.

Simba is open sourced under Apache License 2.0. Currently, it is developed based on Spark 1.6.0. For recent updates and further information, please refer to Simba's homepage.

• Expressive SQL and DataFrame query interface fully compatible with original Spark SQL operators.
• Native distributed indexing support over RDDs.
• Efficient spatial operators: high-throughput & low-latency.
  • Box range query: IN RANGE
  • Circle range query: IN CIRCLERANGE
  • k nearest neighbor query: IN KNN
  • Distance join: DISTANCE JOIN
  • kNN join: KNN JOIN
• Modified Zeppelin: interactive visualization for Simba.
• Spatial-aware optimizations: logical & cost-based.
• Native thread-pool for multi-threading.
• Spatio-Temporal and spatio-textual data analysis (developing)
• Geometric objects support (developing)

Notes: We are still cleaning source codes for some of our features, which will be released to the master and develop branch later.

1. Fork this repo (or create your own branch if you are a member of Simba's main development team) to start your development, DO NOT push your draft version to the master branch
2. You can build your own application in org.apache.spark.examples package for testing or debugging.
3. If you want to merge your feature branch to the main develop branch, please create a pull request from your local branch to develop branch (not the master branch).
4. Use IDE to debug this project. If you use IntelliJ IDEA, INSTALL file contains a way to import the whole project to IntelliJ IDEA

The master branch provides the latest stable version, while the develop branch is the main development branch where new features will be merged before ready to release. For legacy reasons, we also keep branches which archives old versions of Simba, which is developed based on former Spark versions, in the branches named simba-spark-x.x. Note that we will only integrate latest features into master and develop branches. Please make sure you checkout the correct branch before start using it.

• Dong Xie: dongx [at] cs [dot] utah [dot] edu
• Gefei Li: oizz01 [at] sjtu [dot] edu [dot] cn
• Liang Zhou: nichozl [at] sjtu [dot] edu [dot] cn
• Zhongpu Chen: chenzhongpu [at] sjtu [dot] edu [dot] cn
• Feifei Li: lifeifei [at] cs [dot] utah [dot] edu
• Bin Yao: yaobin [at] cs [dot] sjtu [dot] edu [dot] cn
• Minyi Guo: guo-my [at] cs [dot] sjtu [dot] edu [dot] cn