all values in Julia are true objects having a type that belongs to a single, fully connected type graph, all nodes of which are equally first-class as types. 127CHAPTER 12. TYPES 128 • There is no meaningful 12.2 Abstract Types Abstract types cannot be instantiated, and serve only as nodes in the type graph, thereby describing sets of related concrete types: those concrete types which are their descendants commonly called "top" because it is at the apex of the type graph. Julia also has a predefined abstract "bottom" type, at the nadir of the type graph, which is written as Union{}. It is the exact opposite

all values in Julia are true objects having a type that belongs to a single, fully connected type graph, all nodes of which are equally first-class as types. 127CHAPTER 12. TYPES 128 • There is no meaningful 12.2 Abstract Types Abstract types cannot be instantiated, and serve only as nodes in the type graph, thereby describing sets of related concrete types: those concrete types which are their descendants commonly called "top" because it is at the apex of the type graph. Julia also has a predefined abstract "bottom" type, at the nadir of the type graph, which is written as Union{}. It is the exact opposite

all values in Julia are true objects having a type that belongs to a single, fully connected type graph, all nodes of which are equally first-class as types. 127CHAPTER 12. TYPES 128 • There is no meaningful 12.2 Abstract Types Abstract types cannot be instantiated, and serve only as nodes in the type graph, thereby describing sets of related concrete types: those concrete types which are their descendants commonly called "top" because it is at the apex of the type graph. Julia also has a predefined abstract "bottom" type, at the nadir of the type graph, which is written as Union{}. It is the exact opposite

Cluster 有這麼大？Task 有這麼 多？ 11 / 74 我們對 Hadoop 的期許： Batch Job Interactive Query Real-Time Processing Graph Processing Iterative Modeling 人心不足蛇吞象 Hadoop 的體質 (Batch Processing) 問題： 每次就是一個 Batch Job，一個接著一個 processing Inspired by Microsoft Dryad，是 Stinger Initiative 的一部分 Dataflow model on a directed acyclic graph (DAG) of nodes 能夠 讓 Query Plan 更簡單、更有效率 48 / 74 UC Berkeley AMPLab 2009 年的研究計畫，2010 年 Open Source，由 現在是 YARN 裡面眾多語言的之一 Hadoop MapReduce Examples 是最基本的範例 popcorny 提供了一個方便好用的 Gradle 環境組態 因為支援 Hadoop Streaming 的關係，其實要抓蛇的、開珠寶店的也都可以喔： 61 / 74 Dataflow 是 MapReduce 的繼 承者，由數個 Google 內部使用 的技術為基礎，包括資料平行 處理管道技術

all values in Julia are true objects having a type that belongs to a single, fully connected type graph, all nodes of which are equally first-class as types. 127CHAPTER 12. TYPES 128 • There is no meaningful 12.2 Abstract Types Abstract types cannot be instantiated, and serve only as nodes in the type graph, thereby describing sets of related concrete types: those concrete types which are their descendants commonly called "top" because it is at the apex of the type graph. Julia also has a predefined abstract "bottom" type, at the nadir of the type graph, which is written as Union{}. It is the exact opposite

all values in Julia are true objects having a type that belongs to a single, fully connected type graph, all nodes of which are equally first-class as types. 127CHAPTER 12. TYPES 128 • There is no meaningful 12.2 Abstract Types Abstract types cannot be instantiated, and serve only as nodes in the type graph, thereby describing sets of related concrete types: those concrete types which are their descendants commonly called "top" because it is at the apex of the type graph. Julia also has a predefined abstract "bottom" type, at the nadir of the type graph, which is written as Union{}. It is the exact opposite

all values in Julia are true objects having a type that belongs to a single, fully connected type graph, all nodes of which are equally first-class as types. 127CHAPTER 12. TYPES 128 • There is no meaningful 12.2 Abstract Types Abstract types cannot be instantiated, and serve only as nodes in the type graph, thereby describing sets of related concrete types: those concrete types which are their descendants commonly called "top" because it is at the apex of the type graph. Julia also has a predefined abstract "bottom" type, at the nadir of the type graph, which is written as Union{}. It is the exact opposite

all values in Julia are true objects having a type that belongs to a single, fully connected type graph, all nodes of which are equally first-class as types. 127CHAPTER 12. TYPES 128 • There is no meaningful 12.2 Abstract Types Abstract types cannot be instantiated, and serve only as nodes in the type graph, thereby describing sets of related concrete types: those concrete types which are their descendants commonly called "top" because it is at the apex of the type graph. Julia also has a predefined abstract "bottom" type, at the nadir of the type graph, which is written as Union{}. It is the exact opposite

all values in Julia are true objects having a type that belongs to a single, fully connected type graph, all nodes of which are equally first-class as types. 127CHAPTER 12. TYPES 128 • There is no meaningful 12.2 Abstract Types Abstract types cannot be instantiated, and serve only as nodes in the type graph, thereby describing sets of related concrete types: those concrete types which are their descendants commonly called "top" because it is at the apex of the type graph. Julia also has a predefined abstract "bottom" type, at the nadir of the type graph, which is written as Union{}. It is the exact opposite

all values in Julia are true objects having a type that belongs to a single, fully connected type graph, all nodes of which are equally first-class as types. 120CHAPTER 11. TYPES 121 • There is no meaningful 11.2 Abstract Types Abstract types cannot be instantiated, and serve only as nodes in the type graph, thereby describing sets of related concrete types: those concrete types which are their descendants commonly called "top" because it is at the apex of the type graph. Julia also has a predefined abstract "bottom" type, at the nadir of the type graph, which is written as Union{}. It is the exact opposite