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[RxJS] Transformation operators: delay and delayWhen
This lessons teaches about delay and delayWhen: simple operators that time shift. delay(number | date) delayWhen( function :Observable): accept a func ...
分类:Web程序   时间:2016-05-27 20:01:18    阅读次数:166
[RxJS] Transformation operator: buffer, bufferCount, bufferTime
This lesson will teach you about another horizontal combination operator: buffer and its variants. Buffer groups consecutive values together, emitting ...
分类:Web程序   时间:2016-05-27 19:58:02    阅读次数:234
[RxJS] Transformation operator: scan
All of the combination operators take two or more observables as input. These operators may also be alternatively called "vertical combination operato ...
分类:Web程序   时间:2016-05-27 07:04:20    阅读次数:207
Fuzzy Lookup Transformation Usage
Fuzzy Lookup 预先加载一个Reference表,在执行时,Fuzzy Lookup将源数据提取出来,逐行和Reference表中的每行数据进行模糊匹配,输出匹配程度的指数:相似度和信任度(Similarity and Confidence)。Fuzzy Lookup的匹配算法简单描述为: ...
分类:其他好文   时间:2016-05-25 00:21:50    阅读次数:164
[RxJS] Transformation operator: map and mapTo
We made our first operator called multiplyBy, which looks a bit useful, but in practice we don't need it because it's too specific: it only does simpl ...
分类:Web程序   时间:2016-05-24 22:32:45    阅读次数:216
[RxJS] Utility operator: do
We just saw map which is a transformation operator. There are a couple of categories of operators, such as filtering, combination, flattening, etc. On ...
分类:Web程序   时间:2016-05-24 22:20:18    阅读次数:283
Apache Flink源码解析之stream-operator
前面我们谈论了Flink stream中的transformation。你可以将transformation看成编写Flink程序并构建流式处理程序的必要组成部分(静态表现形式);而本篇我们将探讨transformation在Flink运行时对应的动态表现形式——operator。...
分类:Web程序   时间:2016-05-22 12:17:28    阅读次数:294
(转)Kettle命令行
kettle使用命令行来运行ktr和kjb 1:cmd方式运行 1.ktr的运行:运行transformation文件是通过Pan.bat来运行的。 打开cmd命令行窗口,转到Pan.bat所在的目录,如d:\data-integration,然后执行文件的命令为:pan /file D:\etlt ...
分类:其他好文   时间:2016-05-20 11:30:11    阅读次数:134
spark编程指南
去年学习Spark了一段时间,今年捡回来,发现好多东西都已经忘记了。现在讲官方网站上的东西转诉过来,回顾并记录下来。从RDD、action、transformation到persist和共享变量,很多核心概念,翻译的过程中增加了影响,下次忘记了,再看看这篇文章。...
分类:其他好文   时间:2016-05-19 15:14:45    阅读次数:202
ETL中的数据增量抽取机制
ETL中的数据增量抽取机制 ( ETL中的数据增量抽取机制 增量抽取是数据仓库ETL(extraction,transformation,loading,数据的抽取、转换和装载)实施过程中需要重点考虑的问 题。在ETL过程中,增量更新的效率和可行性是决定ETL实施成败的关键问题之一,ETL中的增量更 ...
分类:其他好文   时间:2016-05-19 15:04:37    阅读次数:181
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