(window.webpackJsonp=window.webpackJsonp||[]).push([[422],{822: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:"programming-tsfile-api"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#programming-tsfile-api"}},[s._v("#")]),s._v(" Programming - TsFile API")]),s._v(" "),t("p",[s._v("TsFile is a file format of Time Series we used in IoTDB. In this section, we would like to introduce the usage of this file format.")]),s._v(" "),t("h2",{attrs:{id:"tsfile-libaray-installation"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#tsfile-libaray-installation"}},[s._v("#")]),s._v(" TsFile libaray Installation")]),s._v(" "),t("p",[s._v("There are two ways to use TsFile in your own project.")]),s._v(" "),t("ul",[t("li",[t("p",[s._v("Using as jars:")]),s._v(" "),t("ul",[t("li",[t("p",[s._v("Compile the source codes and build to jars")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("git clone https://github.com/apache/incubator-iotdb.git\ncd tsfile/\nmvn clean package -Dmaven.test.skip=true\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("p",[s._v("Then, all the jars can be get in folder named "),t("code",[s._v("target/")]),s._v(". 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"),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")])])]),s._v(" "),t("li",[t("p",[s._v("add dependencies into your project:")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v(" <dependency>\n   <groupId>org.apache.iotdb</groupId>\n   <artifactId>tsfile</artifactId>\n   <version>0.9.3</version>\n </dependency>\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")])])])]),s._v(" "),t("p",[s._v("Or, you can download the dependencies from official Maven repository:")]),s._v(" 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"),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("span",{staticClass:"line-number"},[s._v("14")]),t("br"),t("span",{staticClass:"line-number"},[s._v("15")]),t("br"),t("span",{staticClass:"line-number"},[s._v("16")]),t("br"),t("span",{staticClass:"line-number"},[s._v("17")]),t("br")])])]),s._v(" "),t("li",[t("p",[s._v("Then add dependencies into your project:")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v(" <dependency>\n   <groupId>org.apache.iotdb</groupId>\n   <artifactId>tsfile</artifactId>\n   <version>0.9.3</version>\n </dependency>\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")])])])])])]),s._v(" "),t("h2",{attrs:{id:"tsfile-usage"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#tsfile-usage"}},[s._v("#")]),s._v(" TSFile Usage")]),s._v(" "),t("p",[s._v("This section demonstrates the detailed usages of TsFile.")]),s._v(" "),t("h3",{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. The set showed in the following table contains one device named "device_1"\nwith three measurements named "sensor_1", "sensor_2" and "sensor_3".')]),s._v(" "),t("table",{staticStyle:{"text-align":"center"}},[t("tr",[t("th",{attrs:{colspan:"6"}},[s._v("device_1")])]),s._v(" "),t("tr",[t("th",{attrs:{colspan:"2"}},[s._v("sensor_1")]),t("th",{attrs:{colspan:"2"}},[s._v("sensor_2")]),t("th",{attrs:{colspan:"2"}},[s._v("sensor_3")])]),s._v(" "),t("tr",[t("th",[s._v("time")]),t("th",[s._v("value")]),t("th",[s._v("time")]),t("th",[s._v("value")]),t("th",[s._v("time")]),t("th",[s._v("value")])]),s._v(" "),t("tr",[t("td",[s._v("1")]),t("td",[s._v("1.2")]),t("td",[s._v("1")]),t("td",[s._v("20")]),t("td",[s._v("2")]),t("td",[s._v("50")])]),s._v(" "),t("tr",[t("td",[s._v("3")]),t("td",[s._v("1.4")]),t("td",[s._v("2")]),t("td",[s._v("20")]),t("td",[s._v("4")]),t("td",[s._v("51")])]),s._v(" "),t("tr",[t("td",[s._v("5")]),t("td",[s._v("1.1")]),t("td",[s._v("3")]),t("td",[s._v("21")]),t("td",[s._v("6")]),t("td",[s._v("52")])]),s._v(" "),t("tr",[t("td",[s._v("7")]),t("td",[s._v("1.8")]),t("td",[s._v("4")]),t("td",[s._v("20")]),t("td",[s._v("8")]),t("td",[s._v("53")])])]),s._v(" "),t("span",[s._v("A set of time-series data")]),s._v(" "),t("p",[t("strong",[s._v("One Line of Data")]),s._v(": In many industrial applications, a device normally contains more than one sensor and these sensors\nmay have values at a same timestamp, which is called one line of data.")]),s._v(" "),t("p",[s._v("Formally, one line of data consists of a "),t("code",[s._v("device_id")]),s._v(", a timestamp which indicates the milliseconds since January 1,\n1970, 00:00:00, and several data pairs composed of "),t("code",[s._v("measurement_id")]),s._v(" and corresponding "),t("code",[s._v("value")]),s._v(". All data pairs in one\nline belong to this "),t("code",[s._v("device_id")]),s._v(" and have the same timestamp. If one of the "),t("code",[s._v("measurements")]),s._v(" does not have a "),t("code",[s._v("value")]),s._v("\nin the "),t("code",[s._v("timestamp")]),s._v(", use a space instead(Actually, TsFile does not store null values). Its format is shown as follow:")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("device_id, timestamp, <measurement_id, value>...\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[s._v("An example is illustrated as follow. In this example, the data type of two measurements are  "),t("code",[s._v("INT32")]),s._v(", "),t("code",[s._v("FLOAT")]),s._v(" respectively.")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("device_1, 1490860659000, m1, 10, m2, 12.12\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("h3",{attrs:{id:"writing-tsfile"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#writing-tsfile"}},[s._v("#")]),s._v(" Writing TsFile")]),s._v(" "),t("h4",{attrs:{id:"generate-a-tsfile-file"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#generate-a-tsfile-file"}},[s._v("#")]),s._v(" Generate a TsFile File.")]),s._v(" "),t("p",[s._v('A TsFile can be generated by following three steps and the complete code will be given in the section "Example for writing TsFile".')]),s._v(" "),t("ul",[t("li",[t("p",[s._v("First, construct a "),t("code",[s._v("TsFileWriter")]),s._v(" instance.")]),s._v(" "),t("p",[s._v("Here are the available constructors:")]),s._v(" "),t("ul",[t("li",[s._v("Without pre-defined schema")])]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("public TsFileWriter(File file) throws IOException\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("ul",[t("li",[s._v("With pre-defined schema")])]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("public TsFileWriter(File file, Schema schema) throws IOException\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[s._v("This one is for using the HDFS file system. "),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, Schema schema) throws IOException \n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br")])]),t("p",[s._v("If you want to set some TSFile configuration on your own, you could use param "),t("code",[s._v("config")]),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('TSFileConfig conf = new TSFileConfig();\nconf.setTSFileStorageFs("HDFS");\nTsFileWriter tsFileWriter = new TsFileWriter(file, schema, conf);\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("p",[s._v("In this example, data files will be stored in HDFS, instead of local file system. If you'd like to store data files in local file system, you can use "),t("code",[s._v('conf.setTSFileStorageFs("LOCAL")')]),s._v(", which is also the default config.")]),s._v(" "),t("p",[s._v("You can also config the ip and port of your HDFS by "),t("code",[s._v("config.setHdfsIp(...)")]),s._v(" and "),t("code",[s._v("config.setHdfsPort(...)")]),s._v(". The default ip is "),t("code",[s._v("localhost")]),s._v(" and default port is "),t("code",[s._v("9000")]),s._v(".")]),s._v(" "),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("config : The config of TsFile.")])])])]),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("Schema")]),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("Schema")]),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 Schema or from an existing map\npublic Schema()\npublic Schema(Map<String, MeasurementSchema> measurements)\n// Use this two interfaces to add measurements\npublic void registerMeasurement(MeasurementSchema descriptor)\npublic void registerMeasurements(Map<String, MeasurementSchema> measurements)\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("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)\npublic MeasurementSchema(String measurementId, TSDataType type, TSEncoding encoding, CompressionType compressionType)\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("p",[t("strong",[s._v("Parameters:")]),s._v("\n​")]),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. See "),t("RouterLink",{attrs:{to:"/UserGuide/V0.9.x/2-Concept/3-Encoding.html"}},[s._v("Chapter 2-3")]),s._v(".")],1)]),s._v(" "),t("li",[t("p",[s._v("compression: The data compression. Now supports "),t("code",[s._v("UNCOMPRESSED")]),s._v(" and "),t("code",[s._v("SNAPPY")]),s._v(".")])]),s._v(" "),t("li",[t("p",[s._v("props: Properties for special data types.Such as "),t("code",[s._v("max_point_number")]),s._v(" for "),t("code",[s._v("FLOAT")]),s._v(" and "),t("code",[s._v("DOUBLE")]),s._v(", "),t("code",[s._v("max_string_length")]),s._v(" for\n"),t("code",[s._v("TEXT")]),s._v('. Use as string pairs into a map such as ("max_point_number", "3").')])])]),s._v(" "),t("blockquote",[t("p",[t("strong",[s._v("Notice:")]),s._v(" Although one measurement name can be used in multiple deltaObjects, the properties cannot be changed. I.e.\nit's not allowed to add one measurement name for multiple times with different type or encoding.\nHere 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("h4",{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. 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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("h4",{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("h5",{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 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Change TsFile Config")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("TSFileConfig config = TSFileDescriptor.getInstance().getConfig();\nconfig.setXXX();\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("h2",{attrs:{id:"bloom-filter"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#bloom-filter"}},[s._v("#")]),s._v(" Bloom filter")]),s._v(" "),t("p",[s._v("Bloom filter checks whether a given time series is in the tsfile before loading metadata. This can improve the performance of loading metadata and skip the tsfile that doesn't contain specified time series.\nIf you want to learn more about its mechanism, you can refer to: "),t("a",{attrs:{href:"https://en.wikipedia.org/wiki/Bloom_filter",target:"_blank",rel:"noopener noreferrer"}},[s._v("wiki page of bloom filter"),t("OutboundLink")],1),s._v(".")]),s._v(" "),t("h4",{attrs:{id:"configuration"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#configuration"}},[s._v("#")]),s._v(" configuration")]),s._v(" "),t("p",[s._v("you can control the false positive rate of bloom filter by changing the bloomFilterErrorRate in TSFileConfig")]),s._v(" "),t("div",{staticClass:"language- line-numbers-mode"},[t("pre",{pre:!0,attrs:{class:"language-text"}},[t("code",[s._v("# The acceptable error rate of bloom filter, should be in [0.01, 0.1], default is 0.05\nbloomFilterErrorRate=0.05\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")])])])}),[],!1,null,null,null);t.default=n.exports}}]);