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CloudI is an open-source private cloud computing framework for efficient, secure, and internal data processing. CloudI provides scaling for previously unscalable source code with efficient fault-tolerant execution of ATS, C/C++, Erlang/Elixir, Go, Haskell, Java, JavaScript/node.js, OCaml, Perl, PHP, Python, or Ruby services.

The bare essentials for efficient fault-tolerant processing on a cloud!

System Requirements

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Released at 2016-09-17 09:04
cloudi 1.5.3 (2 files Hide)

Release Notes

  • services_update is a new addition to the CloudI Service API for updating any service without downtime, i.e., module hot-code reloading with internal services and OS process restarts with external services while CloudI ensures service requests are not lost and service request handlers are not interrupted in any of the service processes or threads (see for more information)
  • A Java user tutorial has been added based on the work of Bruce Kissinger (
  • The Java CloudI API can now use method references with Java 8
  • New service configuration options were added or improved: 'directory', 'dispatcher_pid_options', 'init_pid_options', 'request_pid_options', 'info_pid_options' ( has more information)
  • Many of the database services were removed with their dependencies, from the main repository due to service development demonstrating that failures remain isolated when using a database client locally within a service (database services can help scale usage and make sure it is fault-tolerant, but only after the service business logic is in a stable state and excluding these services will help guide developers)
  • cloudi_service_monitoring was improved:
    • Any Erlang process can create or update metrics now
    • cloudi.log output can be monitored with aspects_log_before or aspects_log_after
    • All CloudI service related metrics now have a static metric name, identified with TYPE.FILENAME.INDEX instead of the service ID as described in the ChangeLog file
  • Erlang internal services now have two optional behaviour functions (some services choose to use only one of the functions):
    • cloudi_service_handle_request/11
    • cloudi_service_handle_info/3
  • Bugs were fixed and other improvements were added (see the ChangeLog for more detail)


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