(window.webpackJsonp=window.webpackJsonp||[]).push([[825],{1395:function(t,e,a){"use strict";a.r(e);var s=a(71),i=Object(s.a)({},(function(){var t=this,e=t.$createElement,a=t._self._c||e;return a("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[a("h1",{attrs:{id:"hierarchy"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#hierarchy"}},[t._v("#")]),t._v(" Hierarchy")]),t._v(" "),a("h2",{attrs:{id:"_1-tsfile-design"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#_1-tsfile-design"}},[t._v("#")]),t._v(" 1. TsFile Design")]),t._v(" "),a("p",[t._v("This is an introduction to the design details of TsFile.")]),t._v(" "),a("h3",{attrs:{id:"_1-1-variable-storage"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#_1-1-variable-storage"}},[t._v("#")]),t._v(" 1.1 Variable Storage")]),t._v(" "),a("ul",[a("li",[a("strong",[t._v("Big Endian")]),t._v("\n​\n"),a("ul",[a("li",[t._v("For Example, the "),a("code",[t._v("int")]),t._v(" "),a("code",[t._v("0x8")]),t._v(" will be stored as "),a("code",[t._v("00 00 00 08")]),t._v(", not "),a("code",[t._v("08 00 00 00")])])])]),t._v(" "),a("li",[a("strong",[t._v("String with Variable Length")]),t._v(" "),a("ul",[a("li",[t._v("The format is "),a("code",[t._v("int size")]),t._v(" plus "),a("code",[t._v("String literal")]),t._v(". 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ChunkMetaData")]),t._v(" "),a("table",[a("thead",[a("tr",[a("th",{staticStyle:{"text-align":"center"}},[t._v("Member Description")]),t._v(" "),a("th",{staticStyle:{"text-align":"center"}},[t._v("Member Type")])])]),t._v(" "),a("tbody",[a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("MeasurementId")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("String")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Start offset of ChunkHeader")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("long")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Number of data points")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("long")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Start time")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("long")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("End time")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("long")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Data type")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("short")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("The statistics of this chunk")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("TsDigest")])])])]),t._v(" "),a("h6",{attrs:{id:"tsdigest"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#tsdigest"}},[t._v("#")]),t._v(" TsDigest")]),t._v(" "),a("p",[t._v("Right now there are five statistics: "),a("code",[t._v("min_value, max_value, first_value, last_value, sum_value")]),t._v(".")]),t._v(" "),a("p",[t._v("In v0.8.x, the storage format of statistics is a name-value pair. That is, "),a("code",[t._v("Map<String, ByteBuffer> statistics")]),t._v(". The name is a string (remember the length is before the literal). But for the value, there is also an integer byteLength acting as the self description length of the following value because the value may be of various type. For example, if the "),a("code",[t._v("min_value")]),t._v(' is an integer 0, then it will be stored as [9 "min_value" 4 0] in the TsFile.')]),t._v(" "),a("p",[t._v("The figure below shows an example of "),a("code",[t._v("TsDigest.deserializeFrom(buffer)")]),t._v(". In v0.8.0, we will get")]),t._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[t._v('Map<String, ByteBuffer> statistics = {\n    "min_value" -> ByteBuffer of int value 0, \n    "last" -> ByteBuffer of int value 19,\n    "sum" -> ByteBuffer of double value 1093347116,\n    "first" -> ByteBuffer of int value 0,\n    "max_value" -> ByteBuffer of int value 99\n}\n')])]),t._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br"),a("span",{staticClass:"line-number"},[t._v("2")]),a("br"),a("span",{staticClass:"line-number"},[t._v("3")]),a("br"),a("span",{staticClass:"line-number"},[t._v("4")]),a("br"),a("span",{staticClass:"line-number"},[t._v("5")]),a("br"),a("span",{staticClass:"line-number"},[t._v("6")]),a("br"),a("span",{staticClass:"line-number"},[t._v("7")]),a("br")])]),a("img",{staticStyle:{width:"100%","max-width":"800px","max-height":"600px","margin-left":"auto","margin-right":"auto",display:"block"},attrs:{src:"https://user-images.githubusercontent.com/33376433/63765352-664a4280-c8fb-11e9-869e-859edf6d00bb.png"}}),t._v(" "),a("p",[t._v("In v0.9.x, the storage format is changed to an array for space and time efficiency. That is, "),a("code",[t._v("ByteBuffer[] statistics")]),t._v(". Each position of the array has a fixed association with a specific type of statistic, following the order defined in StatisticType:")]),t._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[t._v("enum StatisticType {\n    min_value, max_value, first_value, last_value, sum_value\n}\n")])]),t._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br"),a("span",{staticClass:"line-number"},[t._v("2")]),a("br"),a("span",{staticClass:"line-number"},[t._v("3")]),a("br")])]),a("p",[t._v("Therefore, in the above example, we will get")]),t._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[t._v('ByteBuffer[] statistics = [\n    ByteBuffer of int value 0, // associated with "min_value"\n    ByteBuffer of int value 99, // associated with "max_value"\n    ByteBuffer of int value 0, // associated with "first_value"\n    ByteBuffer of int value 19, // associated with "last_value"\n    ByteBuffer of double value 1093347116 // associated with "sum_value"\n]\n')])]),t._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br"),a("span",{staticClass:"line-number"},[t._v("2")]),a("br"),a("span",{staticClass:"line-number"},[t._v("3")]),a("br"),a("span",{staticClass:"line-number"},[t._v("4")]),a("br"),a("span",{staticClass:"line-number"},[t._v("5")]),a("br"),a("span",{staticClass:"line-number"},[t._v("6")]),a("br"),a("span",{staticClass:"line-number"},[t._v("7")]),a("br")])]),a("p",[t._v("As another example in v0.9.x, when deserializing a TsDigest from buffer [3, 0,4,0, 1,4,99, 3,4,19], we get")]),t._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[t._v('ByteBuffer[] statistics = [\n    ByteBuffer of int value 0, // associated with "min_value"\n    ByteBuffer of int value 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"),a("table",[a("thead",[a("tr",[a("th",{staticStyle:{"text-align":"center"}},[t._v("Member Description")]),t._v(" "),a("th",{staticStyle:{"text-align":"center"}},[t._v("Member Type")])])]),t._v(" "),a("tbody",[a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Number of devices")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("int")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Pairs of device name and deviceMetadataIndex")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("String, TsDeviceMetadataIndex pair")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Number of measurements")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("int")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Pairs of measurement name and schema")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("String, MeasurementSchema pair")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Author byte")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("byte")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Author(if author byte is 0x01)")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("String")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("totalChunkNum")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("int")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("invalidChunkNum")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("int")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Bloom filter size")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("int")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Bloom filter bit vector")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("byte[Bloom filter size]")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Bloom filter capacity")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("int")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Bloom filter hash functions size")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("int")])])])]),t._v(" "),a("h6",{attrs:{id:"tsdevicemetadataindex"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#tsdevicemetadataindex"}},[t._v("#")]),t._v(" TsDeviceMetadataIndex")]),t._v(" "),a("table",[a("thead",[a("tr",[a("th",{staticStyle:{"text-align":"center"}},[t._v("Member Description")]),t._v(" "),a("th",{staticStyle:{"text-align":"center"}},[t._v("Member Type")])])]),t._v(" "),a("tbody",[a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("DeviceId")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("String")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Start offset of 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"),a("tbody",[a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("MeasurementId")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("String")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Data type")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("short")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Encoding")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("short")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Compressor")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("short")])]),t._v(" "),a("tr",[a("td",{staticStyle:{"text-align":"center"}},[t._v("Size of props")]),t._v(" "),a("td",{staticStyle:{"text-align":"center"}},[t._v("int")])])])]),t._v(" "),a("p",[t._v("If size of props is greater than 0, there is an array of <String, String> pair as properties of this measurement.")]),t._v(" "),a("p",[t._v('Such as 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You have finished the journey of discovering TsFile.")]),t._v(" "),a("h3",{attrs:{id:"_1-3-tool-set"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#_1-3-tool-set"}},[t._v("#")]),t._v(" 1.3 Tool Set")]),t._v(" "),a("h4",{attrs:{id:"_1-3-1-tsfileresource-print-tool"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#_1-3-1-tsfileresource-print-tool"}},[t._v("#")]),t._v(" 1.3.1 TsFileResource Print Tool")]),t._v(" "),a("p",[t._v("After building the server, the startup script of this tool will appear under the "),a("code",[t._v("server\\target\\iotdb-server-0.9.1\\tools")]),t._v(" directory.")]),t._v(" "),a("p",[t._v("Command:")]),t._v(" "),a("p",[t._v("For Windows:")]),t._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[t._v(".\\print-tsfile-sketch.bat <path of your TsFileResource Directory>\n")])]),t._v(" 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loading config file iotdb-engine.properties, use default configuration\nanalyzing D:\\data\\data\\sequence\\root.vehicle\\1572496142067-101-0.tsfile ...\ndevice root.vehicle.d0, start time 3000 (1970-01-01T08:00:03+08:00[GMT+08:00]), end time 100999 (1970-01-01T08:01:40.999+08:00[GMT+08:00])\nanalyzing the resource file finished.\n")])]),t._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br"),a("span",{staticClass:"line-number"},[t._v("2")]),a("br"),a("span",{staticClass:"line-number"},[t._v("3")]),a("br"),a("span",{staticClass:"line-number"},[t._v("4")]),a("br"),a("span",{staticClass:"line-number"},[t._v("5")]),a("br"),a("span",{staticClass:"line-number"},[t._v("6")]),a("br"),a("span",{staticClass:"line-number"},[t._v("7")]),a("br"),a("span",{staticClass:"line-number"},[t._v("8")]),a("br")])]),a("h4",{attrs:{id:"_1-3-2-tsfile-sketch-tool"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#_1-3-2-tsfile-sketch-tool"}},[t._v("#")]),t._v(" 1.3.2 TsFile Sketch Tool")]),t._v(" "),a("p",[t._v("After building the server, the startup script of this tool will appear under the "),a("code",[t._v("server\\target\\iotdb-server-0.9.1\\tools")]),t._v(" directory.")]),t._v(" "),a("p",[t._v("Command:")]),t._v(" "),a("p",[t._v("For Windows:")]),t._v(" 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number] 000001\n|||||||||||||||||||||   [Chunk Group] of root.vehicle.d0 begins at pos 12, ends at pos 186469, version:102, num of Chunks:6\n                  12|   [Chunk] of s3, numOfPoints:10600, time range:[3000,13599], tsDataType:TEXT,\n                        TsDigest:[min_value:A,max_value:E,first_value:A,last_value:E,sum_value:0.0]\n                    |           [marker] 1\n                    |           [ChunkHeader]\n                    |           11 pages\n               55718|   [Chunk] of s4, numOfPoints:10600, time range:[3000,13599], tsDataType:BOOLEAN,\n                        TsDigest:[min_value:false,max_value:true,first_value:true,last_value:false,sum_value:0.0]\n                    |           [marker] 1\n                    |           [ChunkHeader]\n                    |           11 pages\n               68848|   [Chunk] of s5, numOfPoints:10600, time range:[3000,13599], tsDataType:DOUBLE,\n                        TsDigest:[min_value:3000.0,max_value:13599.0,first_value:3000.0,last_value:13599.0,sum_value:8.79747E7]\n                    |           [marker] 1\n                    |           [ChunkHeader]\n                    |           11 pages\n               98474|   [Chunk] of s0, numOfPoints:21900, time range:[3000,100999], tsDataType:INT32,\n                        TsDigest:[min_value:0,max_value:99,first_value:0,last_value:19,sum_value:889750.0]\n                    |           [marker] 1\n                    |           [ChunkHeader]\n                    |           22 pages\n              123369|   [Chunk] of s1, numOfPoints:21900, time range:[3000,100999], tsDataType:INT64,\n                        TsDigest:[min_value:0,max_value:39,first_value:8,last_value:19,sum_value:300386.0]\n                    |           [marker] 1\n                    |           [ChunkHeader]\n                    |           22 pages\n              144741|   [Chunk] of s2, numOfPoints:21900, time range:[3000,100999], tsDataType:FLOAT,\n                        TsDigest:[min_value:0.0,max_value:122.0,first_value:8.0,last_value:52.0,sum_value:778581.0]\n                    |           [marker] 1\n                    |           [ChunkHeader]\n                    |           22 pages\n              186437|   [Chunk Group Footer]\n                    |           [marker] 0\n                    |           [deviceID] root.vehicle.d0\n                    |           [dataSize] 186425\n                    |           [num of chunks] 6\n|||||||||||||||||||||   [Chunk Group] of root.vehicle.d0 ends\n              186469|   [marker] 2\n              186470|   [TsDeviceMetadata] of root.vehicle.d0, startTime:3000, endTime:100999\n                    |           [startTime] 3000tfi\n                    |           [endTime] 100999\n                    |           [num of ChunkGroupMetaData] 1\n                    |           1 ChunkGroupMetaData\n              187133|   [TsFileMetaData]\n   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