Onyx 0.8.4 发布，分布式计算系统
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[*] 重大改进：Changed the signature of trigger sync function.
[*] New feature: Added support for handling lifecycle exceptions with :lifecycle/handle-exception
[*] New feature: Added the Colocation Task scheduler
[*] Bug fix: Fixed a bug where :flow/from -> :all didn't match compilation step. #464
[*] Bug fix: Fixed an issue where peers didn't restart properly on failure under certain conditions
[*] Enhancement: Switched to 3rd party scheduling library - BtrPlace.
[*] Enhancement: Added parameters for BookKeeper disk threshold error and warnings
[*] Dependency change: Upgraded uk.co.real-logic/aeron-all to 0.2.3
下载：https://github.com/onyx-platform/onyx/archive/0.8.4.zip
Onyx 是什么？
[*] Onyx 是一个无中心、支持云、容错的分布式计算系统
[*] 使用 Clojure 编写
[*] 支持批处理和流处理混合
[*] 提供信息模型用于描述和构建分布式工作流
[*] 竞争对手： Storm, Cascading, Map/Reduce, Dryad, Apache Sqoop, Twitter Crane 等等
用途？
[*] 实时的事件流处理
[*] 连续计算
[*] ETL
[*] 在 MapReduce 进行数据转换
[*] 数据清理
[*] 数据摄入和存储媒介传输
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