(window.webpackJsonp=window.webpackJsonp||[]).push([[221],{620:function(e,s,t){"use strict";t.r(s);var a=t(29),n=Object(a.a)({},(function(){var e=this,s=e._self._c;return s("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[s("h2",{attrs:{id:"tsfile-api"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#tsfile-api"}},[e._v("#")]),e._v(" TsFile API")]),e._v(" "),s("p",[e._v("TsFile is a file format of Time Series used in IoTDB. This session introduces the usage of this file format.")]),e._v(" "),s("h3",{attrs:{id:"tsfile-library-installation"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#tsfile-library-installation"}},[e._v("#")]),e._v(" TsFile library Installation")]),e._v(" "),s("p",[e._v("There are two ways to use TsFile in your own project.")]),e._v(" "),s("ul",[s("li",[e._v("Use as jars: Compile the source codes and build to jars")])]),e._v(" "),s("div",{staticClass:"language- line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-text"}},[s("code",[e._v("git clone https://github.com/apache/iotdb.git\ncd tsfile/\nmvn clean package -Dmaven.test.skip=true\n")])]),e._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[e._v("1")]),s("br"),s("span",{staticClass:"line-number"},[e._v("2")]),s("br"),s("span",{staticClass:"line-number"},[e._v("3")]),s("br")])]),s("p",[e._v("Then, all the jars are in folder named "),s("code",[e._v("target/")]),e._v(". 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A quadruple is defined as (device, measurement, time, value).")]),e._v(" "),s("ul",[s("li",[s("p",[s("strong",[e._v("measurement")]),e._v(": A physical or formal measurement that a time-series data takes, 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.")])]),e._v(" "),s("li",[s("p",[s("strong",[e._v("device")]),e._v(": A device refers to an entity that takes 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 dataset.")])])]),e._v(" "),s("p",[s("strong",[e._v("One Line of Data")]),e._v(": In many industrial applications, a device normally contains more than one sensor and these sensors\nmay have values at the same timestamp, which is called one line of data.")]),e._v(" "),s("p",[e._v("Formally, one line of data consists of a "),s("code",[e._v("device_id")]),e._v(", a timestamp which indicates the milliseconds since January 1,\n1970, 00:00:00, and several data pairs composed of "),s("code",[e._v("measurement_id")]),e._v(" and corresponding "),s("code",[e._v("value")]),e._v(". All data pairs in one\nline belong to this "),s("code",[e._v("device_id")]),e._v(" and have the same timestamp. If one of the "),s("code",[e._v("measurements")]),e._v(" does not have a "),s("code",[e._v("value")]),e._v("\nin the "),s("code",[e._v("timestamp")]),e._v(", use a space instead(Actually, TsFile does not store null values). Its format is shown as follow:")]),e._v(" "),s("div",{staticClass:"language- line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-text"}},[s("code",[e._v("device_id, timestamp, <measurement_id, value>...\n")])]),e._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[e._v("1")]),s("br")])]),s("p",[e._v("An example is illustrated as follow. In this example, the data type of two measurements are  "),s("code",[e._v("INT32")]),e._v(", "),s("code",[e._v("FLOAT")]),e._v(" respectively.")]),e._v(" "),s("div",{staticClass:"language- line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-text"}},[s("code",[e._v("device_1, 1490860659000, m1, 10, m2, 12.12\n")])]),e._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[e._v("1")]),s("br")])]),s("h4",{attrs:{id:"write-tsfile"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#write-tsfile"}},[e._v("#")]),e._v(" Write TsFile")]),e._v(" "),s("p",[e._v('A TsFile is generated by the following three steps and the complete code is given in the section "Example for writing TsFile".')]),e._v(" "),s("ol",[s("li",[s("p",[e._v("construct a "),s("code",[e._v("TsFileWriter")]),e._v(" instance.")]),e._v(" "),s("p",[e._v("Here are the available constructors:")]),e._v(" "),s("ul",[s("li",[e._v("Without pre-defined schema")])]),e._v(" "),s("div",{staticClass:"language- line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-text"}},[s("code",[e._v("public TsFileWriter(File file) throws IOException\n")])]),e._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[e._v("1")]),s("br")])]),s("ul",[s("li",[e._v("With pre-defined schema")])]),e._v(" "),s("div",{staticClass:"language- line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-text"}},[s("code",[e._v("public TsFileWriter(File file, Schema schema) throws IOException\n")])]),e._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[e._v("1")]),s("br")])]),s("p",[e._v("This one is for using the HDFS file system. "),s("code",[e._v("TsFileOutput")]),e._v(" can be an instance of class "),s("code",[e._v("HDFSOutput")]),e._v(".")]),e._v(" "),s("div",{staticClass:"language- line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-text"}},[s("code",[e._v("public TsFileWriter(TsFileOutput output, Schema schema) throws IOException \n")])]),e._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[e._v("1")]),s("br")])]),s("p",[e._v("If you want to set some TSFile configuration on your own, you could use param "),s("code",[e._v("config")]),e._v(". For example:")]),e._v(" "),s("div",{staticClass:"language- line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-text"}},[s("code",[e._v('TSFileConfig conf = new TSFileConfig();\nconf.setTSFileStorageFs("HDFS");\nTsFileWriter tsFileWriter = new TsFileWriter(file, schema, conf);\n')])]),e._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[e._v("1")]),s("br"),s("span",{staticClass:"line-number"},[e._v("2")]),s("br"),s("span",{staticClass:"line-number"},[e._v("3")]),s("br")])]),s("p",[e._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 "),s("code",[e._v('conf.setTSFileStorageFs("LOCAL")')]),e._v(", which is also the default config.")]),e._v(" "),s("p",[e._v("You can also config the ip and rpc port of your HDFS by "),s("code",[e._v("config.setHdfsIp(...)")]),e._v(" and "),s("code",[e._v("config.setHdfsPort(...)")]),e._v(". The default ip is "),s("code",[e._v("localhost")]),e._v(" and default rpc port is "),s("code",[e._v("9000")]),e._v(".")]),e._v(" "),s("p",[s("strong",[e._v("Parameters:")])]),e._v(" "),s("ul",[s("li",[s("p",[e._v("file : The TsFile to write")])]),e._v(" "),s("li",[s("p",[e._v("schema : The file schemas, will be introduced in next part.")])]),e._v(" "),s("li",[s("p",[e._v("config : The config of TsFile.")])])])]),e._v(" "),s("li",[s("p",[e._v("add measurements")]),e._v(" "),s("p",[e._v("Or you can make an instance of class "),s("code",[e._v("Schema")]),e._v(" first and pass this to the constructor of class "),s("code",[e._v("TsFileWriter")])]),e._v(" "),s("p",[e._v("The class "),s("code",[e._v("Schema")]),e._v(" contains a map whose key is the name of one measurement schema, and the value is the schema itself.")]),e._v(" "),s("p",[e._v("Here are the interfaces:")]),e._v(" "),s("div",{staticClass:"language- line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-text"}},[s("code",[e._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")])]),e._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[e._v("1")]),s("br"),s("span",{staticClass:"line-number"},[e._v("2")]),s("br"),s("span",{staticClass:"line-number"},[e._v("3")]),s("br"),s("span",{staticClass:"line-number"},[e._v("4")]),s("br"),s("span",{staticClass:"line-number"},[e._v("5")]),s("br"),s("span",{staticClass:"line-number"},[e._v("6")]),s("br"),s("span",{staticClass:"line-number"},[e._v("7")]),s("br"),s("span",{staticClass:"line-number"},[e._v("8")]),s("br"),s("span",{staticClass:"line-number"},[e._v("9")]),s("br"),s("span",{staticClass:"line-number"},[e._v("10")]),s("br"),s("span",{staticClass:"line-number"},[e._v("11")]),s("br")])]),s("p",[e._v("You can always use the following interface in "),s("code",[e._v("TsFileWriter")]),e._v(" class to add additional measurements:")]),e._v(" "),s("div",{staticClass:"language- line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-text"}},[s("code",[e._v("public void addMeasurement(MeasurementSchema measurementSchema) throws WriteProcessException\n")])]),e._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[e._v("1")]),s("br")])]),s("p",[e._v("The class "),s("code",[e._v("MeasurementSchema")]),e._v(" contains the information of one measurement, there are several constructors:")]),e._v(" "),s("div",{staticClass:"language- line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-text"}},[s("code",[e._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")])]),e._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[e._v("1")]),s("br"),s("span",{staticClass:"line-number"},[e._v("2")]),s("br"),s("span",{staticClass:"line-number"},[e._v("3")]),s("br"),s("span",{staticClass:"line-number"},[e._v("4")]),s("br")])]),s("p",[s("strong",[e._v("Parameters:")]),e._v("\n​")]),e._v(" "),s("ul",[s("li",[s("p",[e._v("measurementID: The name of this measurement, typically the name of the sensor.")])]),e._v(" "),s("li",[s("p",[e._v("type: The data type, now support six types: "),s("code",[e._v("BOOLEAN")]),e._v(", "),s("code",[e._v("INT32")]),e._v(", "),s("code",[e._v("INT64")]),e._v(", "),s("code",[e._v("FLOAT")]),e._v(", "),s("code",[e._v("DOUBLE")]),e._v(", "),s("code",[e._v("TEXT")]),e._v(";")])]),e._v(" "),s("li",[s("p",[e._v("encoding: The data encoding.")])]),e._v(" "),s("li",[s("p",[e._v("compression: The data compression.")])]),e._v(" "),s("li",[s("p",[e._v("props: Properties for special data types.Such as "),s("code",[e._v("max_point_number")]),e._v(" for "),s("code",[e._v("FLOAT")]),e._v(" and "),s("code",[e._v("DOUBLE")]),e._v(", "),s("code",[e._v("max_string_length")]),e._v(" for\n"),s("code",[e._v("TEXT")]),e._v('. Use as string pairs into a map such as ("max_point_number", "3").')])])]),e._v(" "),s("blockquote",[s("p",[s("strong",[e._v("Notice:")]),e._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:")])]),e._v(" "),s("div",{staticClass:"language- extra-class"},[s("pre",[s("code",[e._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')])])])]),e._v(" "),s("li",[s("p",[e._v("insert and write data continually.")]),e._v(" "),s("p",[e._v("Use this interface to create a new "),s("code",[e._v("TSRecord")]),e._v("(a timestamp and device pair).")]),e._v(" "),s("div",{staticClass:"language- line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-text"}},[s("code",[e._v("public TSRecord(long timestamp, String deviceId)\n")])]),e._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[e._v("1")]),s("br")])]),s("p",[e._v("Then create a "),s("code",[e._v("DataPoint")]),e._v("(a measurement and value pair), and use the addTuple method to add the DataPoint to the correct\nTsRecord.")]),e._v(" "),s("p",[e._v("Use this method to write")]),e._v(" "),s("div",{staticClass:"language- line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-text"}},[s("code",[e._v("public void write(TSRecord record) throws IOException, WriteProcessException\n")])]),e._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[e._v("1")]),s("br")])])]),e._v(" "),s("li",[s("p",[e._v("call "),s("code",[e._v("close")]),e._v(" to finish this writing process.")]),e._v(" "),s("div",{staticClass:"language- line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-text"}},[s("code",[e._v("public void close() throws IOException\n")])]),e._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[e._v("1")]),s("br")])])])]),e._v(" "),s("p",[e._v("We are also able to write data into a closed TsFile.")]),e._v(" "),s("ol",[s("li",[s("p",[e._v("Use "),s("code",[e._v("ForceAppendTsFileWriter")]),e._v(" to open a closed file.")]),e._v(" "),s("div",{staticClass:"language- line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-text"}},[s("code",[e._v("public ForceAppendTsFileWriter(File file) throws IOException\n")])]),e._v(" "),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[e._v("1")]),s("br")])])]),e._v(" "),s("li",[s("p",[e._v("call "),s("code",[e._v("doTruncate")]),e._v(" truncate the part of Metadata")])]),e._v(" "),s("li",[s("p",[e._v("Then use "),s("code",[e._v("ForceAppendTsFileWriter")]),e._v(" to construct a new "),s("code",[e._v("TsFileWriter")])])])]),e._v(" "),s("div",{staticClass:"language- 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a TsFile by constructing "),s("strong",[e._v("TSRecord")]),e._v(" if you have the "),s("strong",[e._v("non-aligned")]),e._v(" (e.g. not all sensors contain values) time series data.")]),e._v(" "),s("p",[e._v("A more thorough example can be found at "),s("code",[e._v("/example/tsfile/src/main/java/org/apache/iotdb/tsfile/TsFileWriteWithTSRecord.java")])]),e._v(" "),s("p",[e._v("You could write a TsFile by constructing "),s("strong",[e._v("Tablet")]),e._v(" if you have the "),s("strong",[e._v("aligned")]),e._v(" time series data.")]),e._v(" "),s("p",[e._v("A more thorough example can be found at "),s("code",[e._v("/example/tsfile/src/main/java/org/apache/iotdb/tsfile/TsFileWriteWithTablet.java")])]),e._v(" "),s("p",[e._v("You could write data into a closed TsFile by using "),s("strong",[e._v("ForceAppendTsFileWriter")]),e._v(".")]),e._v(" "),s("p",[e._v("A more thorough example can be found at 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