Onyx 0.8.0 发布，分布式计算系统
12月12日北京OSC源创会 —— 开源技术的年终盛典 »Onyx 0.8.0 发布，此版本最主要是增加了自动化状态管理功能，恢复，Windowing 和触发器。状态会被记录在 BookKeeper 日志记录，segments 可以使用嵌入式 RocksDB 删除处理。开箱支持多个类型的聚合。
升级注意事项：
[*] Onyx 0.8.0 不兼容之前的版本
改进列表：
[*] Breaking change :onyx.messaging/peer-port-range and :onyx.messaging/peer-ports are deprecated in favour of a single :onyx.messaging/peer-port port. The Aeron layer multiplexed all communication over a single port so multiple port selection is longer required.
[*] Important change: default task batch timeout was reduced from 1000ms to 50ms.
[*] New major feature: Windowing and Triggers.
[*] New feature: Fixed windows
[*] New feature: Sliding windows
[*] New feature: Session windows
[*] New feature: Global windows
[*] New feature: Timer triggers
[*] New feature: Segment-based triggers
[*] New feature: Watermark triggers
[*] New feature: Percentile Watermark triggers
[*] New feature: Punctuation triggers
[*] New feature: Accumulating refinement mode
[*] New feature: Discarding refinement mode
[*] New feature: BookKeeper & embedded RocksDB automatic "exactly once" filtering.
[*] New feature: friendlier error messages. Added custom schema error handlers to print out documentation and required types in a more customized format.
[*] New flux policy: Recover
[*] New lifecycle: after-read-batch
[*] New metric: peer-send-bytes
[*] Bug fix: fixed an issue where the percentage job scheduler would misallocate.
[*] Bug fix: fixed :data key being removed from exception messages in the logs.
详细改进内容请看发行说明。
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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