(window.webpackJsonp=window.webpackJsonp||[]).push([[397],{793:function(s,t,a){"use strict";a.r(t);var e=a(29),n=Object(e.a)({},(function(){var s=this,t=s._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":s.$parent.slotKey}},[t("h1",{attrs:{id:"usage"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#usage"}},[s._v("#")]),s._v(" Usage")]),s._v(" "),t("p",[s._v("Now, you are ready to start doing some awesome things with TsFile. This section demonstrates the detailed usages of TsFile.")]),s._v(" "),t("h2",{attrs:{id:"time-series-data"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#time-series-data"}},[s._v("#")]),s._v(" Time-series Data")]),s._v(" "),t("p",[s._v("A time-series is considered as a sequence of quadruples. A quadruple is defined as (device, measurement, time, value).")]),s._v(" "),t("ul",[t("li",[t("p",[t("strong",[s._v("measurement")]),s._v(": A physical or formal measurement that a time-series is taking, e.g., the temperature of a city, the\nsales number of some goods or the speed of a train at different times. As a traditional sensor (like a thermometer) also\ntakes a single measurement and produce a time-series, we will use measurement and sensor interchangeably below.")])]),s._v(" "),t("li",[t("p",[t("strong",[s._v("device")]),s._v(": A device refers to an entity that is taking several measurements (producing multiple time-series), e.g.,\na running train monitors its speed, oil meter, miles it has run, current passengers each is conveyed to a time-series.")])])]),s._v(" "),t("p",[s._v('Table 1 illustrates a set of time-series data. 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"),t("code",[s._v("TsFileOutput")]),s._v(" can be an instance of class "),t("code",[s._v("HDFSOutput")]),s._v(".")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("public TsFileWriter(TsFileOutput output, FileSchema schema) throws IOException \n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[t("strong",[s._v("Parameters:")])]),s._v(" "),t("ul",[t("li",[t("p",[s._v("file : The TsFile to write")])]),s._v(" "),t("li",[t("p",[s._v("schema : The file schemas, will be introduced in next part.")])])])]),s._v(" "),t("li",[t("p",[s._v("Second, add measurements")]),s._v(" "),t("p",[s._v("Or you can make an instance of class "),t("code",[s._v("FileSchema")]),s._v(" first and pass this to the constructor of class "),t("code",[s._v("TsFileWriter")])]),s._v(" "),t("p",[s._v("The class "),t("code",[s._v("FileSchema")]),s._v(" contains a map whose key is the name of one measurement schema, and the value is the schema itself.")]),s._v(" "),t("p",[s._v("Here are the interfaces:")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("// Create an empty FileSchema or from an existing map\npublic FileSchema()\npublic FileSchema(Map<String, MeasurementSchema> measurements)\n\n// Use this two interfaces to add measurements\npublic void registerMeasurement(MeasurementSchema descriptor)\npublic void registerMeasurements(Map<String, MeasurementSchema> measurements)\n\n// Some useful getter and checker\npublic TSDataType getMeasurementDataType(String measurementId)\npublic MeasurementSchema getMeasurementSchema(String measurementId)\npublic Map<String, MeasurementSchema> getAllMeasurementSchema()\npublic boolean hasMeasurement(String measurementId)\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br"),t("span",{staticClass:"line-number"},[s._v("11")]),t("br"),t("span",{staticClass:"line-number"},[s._v("12")]),t("br"),t("span",{staticClass:"line-number"},[s._v("13")]),t("br")])]),t("p",[s._v("You can always use the following interface in "),t("code",[s._v("TsFileWriter")]),s._v(" class to add additional measurements:\n​")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("public void addMeasurement(MeasurementSchema measurementSchema) throws WriteProcessException\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[s._v("The class "),t("code",[s._v("MeasurementSchema")]),s._v(" contains the information of one measurement, there are several constructors:")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("public MeasurementSchema(String measurementId, TSDataType type, TSEncoding encoding)\n\npublic MeasurementSchema(String measurementId, TSDataType type, TSEncoding encoding, CompressionType compressionType)\n\npublic MeasurementSchema(String measurementId, TSDataType type, TSEncoding encoding, CompressionType compressionType, \nMap<String, String> props)\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br")])]),t("p",[t("strong",[s._v("Parameters:")])]),s._v(" "),t("ul",[t("li",[t("p",[s._v("measurementID: The name of this measurement, typically the name of the sensor.")])]),s._v(" "),t("li",[t("p",[s._v("type: The data type, now support six types: "),t("code",[s._v("BOOLEAN")]),s._v(", "),t("code",[s._v("INT32")]),s._v(", "),t("code",[s._v("INT64")]),s._v(", "),t("code",[s._v("FLOAT")]),s._v(", "),t("code",[s._v("DOUBLE")]),s._v(", "),t("code",[s._v("TEXT")]),s._v(";")])]),s._v(" "),t("li",[t("p",[s._v("encoding: The data encoding. 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I.e.\n​    it's not allowed to add one measurement name for multiple times with different type or encoding.\n​    Here is a bad example:")])]),s._v(" "),t("div",{staticClass:"language- extra-class"},[t("pre",[t("code",[s._v('  // The measurement "sensor_1" is float type\n  addMeasurement(new MeasurementSchema("sensor_1", TSDataType.FLOAT, TSEncoding.RLE));\n  \n  // This call will throw a WriteProcessException exception\n  addMeasurement(new MeasurementSchema("sensor_1", TSDataType.INT32, TSEncoding.RLE));\n')])])])]),s._v(" "),t("li",[t("p",[s._v("Third, insert and write data continually.")]),s._v(" "),t("p",[s._v("Use this interface to create a new "),t("code",[s._v("TSRecord")]),s._v("(a timestamp and device pair).")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("public TSRecord(long timestamp, String deviceId)\n")])]),s._v(" 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Interface for Reading TsFile")]),s._v(" "),t("h3",{attrs:{id:"before-the-start"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#before-the-start"}},[s._v("#")]),s._v(" Before the Start")]),s._v(" "),t("p",[s._v('The set of time-series data in section "Time-series Data" is used here for a concrete introduction in this section. The set showed in the following table contains one deltaObject named "device_1" with three measurements named "sensor_1", "sensor_2" and "sensor_3". And the measurements has been simplified to do a simple illustration, which contains only 4 time-value pairs each.')]),s._v(" "),t("table",[t("thead",[t("tr",[t("th",{staticStyle:{"text-align":"center"}},[s._v("Relationship")]),s._v(" "),t("th",{staticStyle:{"text-align":"center"}},[s._v("Description")])])]),s._v(" "),t("tbody",[t("tr",[t("td",{staticStyle:{"text-align":"center"}},[s._v("TimeFilter.eq(value)")]),s._v(" "),t("td",{staticStyle:{"text-align":"center"}},[s._v("Choose the time equal to the value")])]),s._v(" "),t("tr",[t("td",{staticStyle:{"text-align":"center"}},[s._v("TimeFilter.lt(value)")]),s._v(" "),t("td",{staticStyle:{"text-align":"center"}},[s._v("Choose the time less than the value")])]),s._v(" "),t("tr",[t("td",{staticStyle:{"text-align":"center"}},[s._v("TimeFilter.gt(value)")]),s._v(" "),t("td",{staticStyle:{"text-align":"center"}},[s._v("Choose the time greater than the value")])]),s._v(" "),t("tr",[t("td",{staticStyle:{"text-align":"center"}},[s._v("TimeFilter.ltEq(value)")]),s._v(" "),t("td",{staticStyle:{"text-align":"center"}},[s._v("Choose the time less than or equal to the value")])]),s._v(" "),t("tr",[t("td",{staticStyle:{"text-align":"center"}},[s._v("TimeFilter.gtEq(value)")]),s._v(" "),t("td",{staticStyle:{"text-align":"center"}},[s._v("Choose the time greater than or equal to the value")])]),s._v(" "),t("tr",[t("td",{staticStyle:{"text-align":"center"}},[s._v("TimeFilter.notEq(value)")]),s._v(" "),t("td",{staticStyle:{"text-align":"center"}},[s._v("Choose the time not equal to the value")])]),s._v(" "),t("tr",[t("td",{staticStyle:{"text-align":"center"}},[s._v("TimeFilter.not(TimeFilter)")]),s._v(" "),t("td",{staticStyle:{"text-align":"center"}},[s._v("Choose the time not satisfy another TimeFilter")])])])]),s._v(" "),t("h3",{attrs:{id:"definition-of-path"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#definition-of-path"}},[s._v("#")]),s._v(" Definition of Path")]),s._v(" "),t("p",[s._v('A path is a dot-separated string which uniquely identifies a time-series in TsFile, e.g., "root.area_1.device_1.sensor_1".\nThe last section "sensor_1" is called "measurementId" while the remaining parts "root.area_1.device_1" is called deviceId.\nAs mentioned above, the same measurement in different devices has the same data type and encoding, and devices are also unique.')]),s._v(" "),t("p",[s._v("In read interfaces, The parameter "),t("code",[s._v("paths")]),s._v(" indicates the measurements to be selected.")]),s._v(" "),t("p",[s._v("Path instance can be easily constructed through the class "),t("code",[s._v("Path")]),s._v(". For example:")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v('Path p = new Path("device_1.sensor_1");\n')])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[s._v("We will pass an ArrayList of paths for final query call to support multiple paths.")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v('List<Path> paths = new ArrayList<Path>();\npaths.add(new Path("device_1.sensor_1"));\npaths.add(new Path("device_1.sensor_3"));\n')])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br")])]),t("blockquote",[t("p",[t("strong",[s._v("Notice:")]),s._v(" When constructing a Path, the format of the parameter should be a dot-separated string, the last part will\nbe recognized as measurementId while the remaining parts will be recognized as deviceId.")])]),s._v(" "),t("h3",{attrs:{id:"definition-of-filter"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#definition-of-filter"}},[s._v("#")]),s._v(" Definition of Filter")]),s._v(" "),t("h4",{attrs:{id:"usage-scenario"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#usage-scenario"}},[s._v("#")]),s._v(" Usage Scenario")]),s._v(" "),t("p",[s._v("Filter is used in TsFile reading process to select data satisfying one or more given condition(s).")]),s._v(" "),t("h4",{attrs:{id:"iexpression"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#iexpression"}},[s._v("#")]),s._v(" IExpression")]),s._v(" "),t("p",[s._v("The "),t("code",[s._v("IExpression")]),s._v(" is a filter expression interface and it will be passed to our final query call.\nWe create one or more filter expressions and may use binary filter operators to link them to our final expression.")]),s._v(" "),t("ul",[t("li",[t("p",[t("strong",[s._v("Create a Filter Expression")])]),s._v(" "),t("p",[s._v("There are two types of filters.")]),s._v(" "),t("ul",[t("li",[s._v("TimeFilter: A filter for "),t("code",[s._v("time")]),s._v(" in time-series data."),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("IExpression timeFilterExpr = new GlobalTimeExpression(TimeFilter);\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])])])]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v(" \tUse the following relationships to get a `TimeFilter` object (value is a long int variable).\n\n|        Relationship        |                    Description                     |\n| :------------------------: | 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added to support partial query:")]),s._v(" "),t("ul",[t("li",[t("code",[s._v("partitionStartOffset")]),s._v(": start offset for a TsFile")]),s._v(" "),t("li",[t("code",[s._v("partitionEndOffset")]),s._v(": end offset for a TsFile")])]),s._v(" "),t("blockquote",[t("p",[t("strong",[s._v("What is Partial Query ?")])]),s._v(" "),t("p",[s._v('In some distributed file systems(e.g. HDFS), a file is split into severval parts which are called "Blocks" and stored in different nodes. 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