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blob: 82412216ccb967df7097253a413cad04e7fddaa1 [file] [log] [blame]
(window.webpackJsonp=window.webpackJsonp||[]).push([[479],{1045:function(s,t,a){"use strict";a.r(t);var n=a(68),e=Object(n.a)({},(function(){var s=this,t=s.$createElement,a=s._self._c||t;return a("ContentSlotsDistributor",{attrs:{"slot-key":s.$parent.slotKey}},[a("h1",{attrs:{id:"用法"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#用法"}},[s._v("#")]),s._v(" 用法")]),s._v(" "),a("p",[s._v("现在，您准备开始使用TsFile做一些很棒的事情。 本节演示TsFile的详细用法。")]),s._v(" "),a("h2",{attrs:{id:"时间序列数据"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#时间序列数据"}},[s._v("#")]),s._v(" 时间序列数据")]),s._v(" "),a("p",[s._v("时间序列被视为四倍序列。 四元组定义为（设备，测量，时间，值）。")]),s._v(" "),a("ul",[a("li",[a("p",[a("strong",[s._v("测量")]),s._v(": 时间序列进行的物理或形式测量，例如城市温度，某些商品的销售数量或火车在不同时间的速度。 由于传统的传感器（例如温度计）也需要进行一次测量并生成一个时间序列，因此我们将在下面互换使用测量和传感器。")])]),s._v(" "),a("li",[a("p",[a("strong",[s._v("设备")]),s._v(": 设备是指正在执行多个测量（产生多个时间序列）的实体，例如，运行中的火车监视其速度，油表，行驶里程，当前乘客均被传送到一个时间序列。")])])]),s._v(" "),a("p",[s._v("表1说明了一组时间序列数据。 下表中显示的集合包含一个名为“ device_1”的设备以及三个名为“ sensor_1”，“ sensor_2”和“ sensor_3”的测量值。")]),s._v(" "),a("center",[a("table",{staticStyle:{"text-align":"center"}},[a("tr",[a("th",{attrs:{colspan:"6"}},[s._v("device_1")])]),s._v(" "),a("tr",[a("th",{attrs:{colspan:"2"}},[s._v("sensor_1")]),a("th",{attrs:{colspan:"2"}},[s._v("sensor_2")]),a("th",{attrs:{colspan:"2"}},[s._v("sensor_3")])]),s._v(" "),a("tr",[a("th",[s._v("time")]),a("th",[s._v("value")]),a("th",[s._v("time")]),a("th",[s._v("value")]),a("th",[s._v("time")]),a("th",[s._v("value")])]),s._v(" "),a("tr",[a("td",[s._v("1")]),a("td",[s._v("1.2")]),a("td",[s._v("1")]),a("td",[s._v("20")]),a("td",[s._v("2")]),a("td",[s._v("50")])]),s._v(" "),a("tr",[a("td",[s._v("3")]),a("td",[s._v("1.4")]),a("td",[s._v("2")]),a("td",[s._v("20")]),a("td",[s._v("4")]),a("td",[s._v("51")])]),s._v(" "),a("tr",[a("td",[s._v("5")]),a("td",[s._v("1.1")]),a("td",[s._v("3")]),a("td",[s._v("21")]),a("td",[s._v("6")]),a("td",[s._v("52")])]),s._v(" "),a("tr",[a("td",[s._v("7")]),a("td",[s._v("1.8")]),a("td",[s._v("4")]),a("td",[s._v("20")]),a("td",[s._v("8")]),a("td",[s._v("53")])])]),s._v(" "),a("span",[s._v("一组时间序列数据")])]),s._v(" "),a("p",[a("strong",[s._v("一行数据")]),s._v(": 在许多工业应用中，设备通常包含多个传感器，并且这些传感器可能在同一时间戳上具有值，这称为一行数据。")]),s._v(" "),a("p",[s._v("形式上，一行数据由一个"),a("code",[s._v("device_id")]),s._v("，一个指示自1970年1月1日以来的毫秒数，00：00：00组成的时间戳，以及由"),a("code",[s._v("measurement_id")]),s._v("和对应的"),a("code",[s._v("value")]),s._v("组成的几对数据组成。 一行中的所有数据对都属于该"),a("code",[s._v("device_id")]),s._v("，并且具有相同的时间戳。 如果其中一个"),a("code",[s._v("measurements")]),s._v(" 在"),a("code",[s._v("value")]),s._v(" 中没有"),a("code",[s._v("value")]),s._v("，请改用空格（实际上，TsFile不存储空值）。 其格式如下所示：")]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("device_id, timestamp, <measurement_id, value>...\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br")])]),a("p",[s._v("一个示例如下所示。 在此示例中，两个测量的数据类型分别为INT32和FLOAT。")]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("device_1, 1490860659000, m1, 10, m2, 12.12\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br")])]),a("h2",{attrs:{id:"编写tsfile"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#编写tsfile"}},[s._v("#")]),s._v(" 编写TsFile")]),s._v(" "),a("h3",{attrs:{id:"生成一个tsfile文件。"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#生成一个tsfile文件。"}},[s._v("#")]),s._v(" 生成一个TsFile文件。")]),s._v(" "),a("p",[s._v("可以通过以下三个步骤来生成TsFile，完整的代码将在“编写TsFile的示例”部分中给出。")]),s._v(" "),a("ul",[a("li",[a("p",[s._v("首先，构造一个"),a("code",[s._v("TsFileWriter")]),s._v("实例。")]),s._v(" "),a("p",[s._v("以下是可用的构造函数：")]),s._v(" "),a("ul",[a("li",[s._v("没有预定义的架构")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("public TsFileWriter(File file) throws IOException\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br")])]),a("ul",[a("li",[s._v("使用预定义的架构")])]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("public TsFileWriter(File file, FileSchema schema) throws IOException\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br")])]),a("p",[s._v("这是用于使用HDFS文件系统的。 "),a("code",[s._v("TsFileOutput")]),s._v("可以是"),a("code",[s._v("HDFSOutput")]),s._v("类的实例。")]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("public TsFileWriter(TsFileOutput output, 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MeasurementSchema> measurements)\n \n// 一些有用的吸气剂和检查剂\npublic TSDataType getMeasurementDataType(String measurementId)\npublic MeasurementSchema getMeasurementSchema(String measurementId)\npublic Map<String, MeasurementSchema> getAllMeasurementSchema()\npublic boolean hasMeasurement(String measurementId)\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br"),a("span",{staticClass:"line-number"},[s._v("5")]),a("br"),a("span",{staticClass:"line-number"},[s._v("6")]),a("br"),a("span",{staticClass:"line-number"},[s._v("7")]),a("br"),a("span",{staticClass:"line-number"},[s._v("8")]),a("br"),a("span",{staticClass:"line-number"},[s._v("9")]),a("br"),a("span",{staticClass:"line-number"},[s._v("10")]),a("br"),a("span",{staticClass:"line-number"},[s._v("11")]),a("br"),a("span",{staticClass:"line-number"},[s._v("12")]),a("br"),a("span",{staticClass:"line-number"},[s._v("13")]),a("br")])]),a("p",[s._v("您可以始终在"),a("code",[s._v("TsFileWriter")]),s._v("类中使用以下接口来添加其他度量：\n​")]),s._v(" "),a("div",{staticClass:"language- 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"),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br"),a("span",{staticClass:"line-number"},[s._v("2")]),a("br"),a("span",{staticClass:"line-number"},[s._v("3")]),a("br"),a("span",{staticClass:"line-number"},[s._v("4")]),a("br"),a("span",{staticClass:"line-number"},[s._v("5")]),a("br"),a("span",{staticClass:"line-number"},[s._v("6")]),a("br")])]),a("p",[a("strong",[s._v("参数：")])]),s._v(" "),a("ul",[a("li",[a("p",[s._v("measurementID：此测量的名称，通常是传感器的名称。")])]),s._v(" "),a("li",[a("p",[s._v("类型：数据类型，现在支持六种类型："),a("code",[s._v("BOOLEAN")]),s._v("，"),a("code",[s._v("INT32")]),s._v("，"),a("code",[s._v("INT64")]),s._v("，"),a("code",[s._v("FLOAT")]),s._v("，"),a("code",[s._v("DOUBLE")]),s._v("，"),a("code",[s._v("TEXT")]),s._v("。")])]),s._v(" "),a("li",[a("p",[s._v("encoding：数据编码。 看到 "),a("RouterLink",{attrs:{to:"/zh/UserGuide/V0.8.x/2-Concept Key Concepts and Terminology/3-Encoding.html"}},[s._v("章节 2-3")]),s._v(".")],1)]),s._v(" "),a("li",[a("p",[s._v("compression：数据压缩。 现在支持"),a("code",[s._v("UNCOMPRESSED")]),s._v("和"),a("code",[s._v("SNAPPY")]),s._v("。")])]),s._v(" "),a("li",[a("p",[s._v("props：特殊数据类型的属性，例如"),a("code",[s._v("FLOAT")]),s._v("和"),a("code",[s._v("DOUBLE")]),s._v("的"),a("code",[s._v("max_point_number")]),s._v("，"),a("code",[s._v("TEXT")]),s._v("的"),a("code",[s._v("max_string_length")]),s._v("。 用作字符串对，例如（“ max_point_number”，“ 3”）。")])])]),s._v(" "),a("blockquote",[a("p",[s._v("**注意：**尽管一个度量名称可以在多个deltaObject中使用，但是不能更改属性。 即 不允许多次使用不同的类型或编码添加一个测量名称。\n这是一个不好的例子：")])]),s._v(" "),a("div",{staticClass:"language- extra-class"},[a("pre",[a("code",[s._v(' // 测量值“ sensor_1”为浮点型\n addMeasurement(new MeasurementSchema("sensor_1", TSDataType.FLOAT, TSEncoding.RLE));\n \n // 此调用将引发WriteProcessException异常\n addMeasurement(new MeasurementSchema("sensor_1", TSDataType.INT32, TSEncoding.RLE));\n')])])])]),s._v(" "),a("li",[a("p",[s._v("第三，连续插入和写入数据。")]),s._v(" "),a("p",[s._v("使用此接口可以创建新的"),a("code",[s._v("TSRecord")]),s._v("（时间戳和设备对）。")]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("public TSRecord(long timestamp, String deviceId)\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br")])]),a("p",[s._v("然后创建一个"),a("code",[s._v("DataPoint")]),s._v("（一个测量值和一个值对），并使用"),a("code",[s._v("addTuple")]),s._v("方法将"),a("code",[s._v("DataPoint")]),s._v("添加到正确的TsRecord。")]),s._v(" "),a("p",[s._v("用这种方法写")]),s._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[s._v("public void write(TSRecord record) throws IOException, WriteProcessException\n")])]),s._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[s._v("1")]),a("br")])])]),s._v(" 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