(window.webpackJsonp=window.webpackJsonp||[]).push([[87],{653:function(e,t,a){"use strict";a.r(t);var s=a(70),n=Object(s.a)({},(function(){var e=this,t=e.$createElement,a=e._self._c||t;return a("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[a("h2",{attrs:{id:"hive-tsfile"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#hive-tsfile"}},[e._v("#")]),e._v(" Hive-TsFile")]),e._v(" "),a("h3",{attrs:{id:"about-hive-tsfile-connector"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#about-hive-tsfile-connector"}},[e._v("#")]),e._v(" About Hive-TsFile-Connector")]),e._v(" "),a("p",[e._v("Hive-TsFile-Connector implements the support of Hive for external data sources of Tsfile type. This enables users to operate TsFile by Hive.")]),e._v(" "),a("p",[e._v("With this connector, you can")]),e._v(" "),a("ul",[a("li",[e._v("Load a single TsFile, from either the local file system or hdfs, into hive")]),e._v(" "),a("li",[e._v("Load all files in a specific directory, from either the local file system or hdfs, into hive")]),e._v(" "),a("li",[e._v("Query the tsfile through HQL.")]),e._v(" "),a("li",[e._v("As of now, the write operation is not supported in hive-connector. So, insert operation in HQL is not allowed while operating tsfile through hive.")])]),e._v(" "),a("h3",{attrs:{id:"system-requirements"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#system-requirements"}},[e._v("#")]),e._v(" System Requirements")]),e._v(" "),a("table",[a("thead",[a("tr",[a("th",[e._v("Hadoop Version")]),e._v(" "),a("th",[e._v("Hive Version")]),e._v(" "),a("th",[e._v("Java Version")]),e._v(" "),a("th",[e._v("TsFile")])])]),e._v(" "),a("tbody",[a("tr",[a("td",[a("code",[e._v("2.7.3")]),e._v(" or "),a("code",[e._v("3.2.1")])]),e._v(" "),a("td",[a("code",[e._v("2.3.6")]),e._v(" or "),a("code",[e._v("3.1.2")])]),e._v(" "),a("td",[a("code",[e._v("1.8")])]),e._v(" "),a("td",[a("code",[e._v("0.13.0-SNAPSHOT")])])])])]),e._v(" "),a("blockquote",[a("p",[e._v("Note: For more information about how to download and use TsFile, please see the following link: https://github.com/apache/iotdb/tree/master/tsfile.")])]),e._v(" "),a("h3",{attrs:{id:"data-type-correspondence"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#data-type-correspondence"}},[e._v("#")]),e._v(" Data Type Correspondence")]),e._v(" "),a("table",[a("thead",[a("tr",[a("th",[e._v("TsFile data type")]),e._v(" "),a("th",[e._v("Hive field type")])])]),e._v(" "),a("tbody",[a("tr",[a("td",[e._v("BOOLEAN")]),e._v(" "),a("td",[e._v("Boolean")])]),e._v(" "),a("tr",[a("td",[e._v("INT32")]),e._v(" "),a("td",[e._v("INT")])]),e._v(" "),a("tr",[a("td",[e._v("INT64")]),e._v(" "),a("td",[e._v("BIGINT")])]),e._v(" "),a("tr",[a("td",[e._v("FLOAT")]),e._v(" "),a("td",[e._v("Float")])]),e._v(" "),a("tr",[a("td",[e._v("DOUBLE")]),e._v(" "),a("td",[e._v("Double")])]),e._v(" "),a("tr",[a("td",[e._v("TEXT")]),e._v(" "),a("td",[e._v("STRING")])])])]),e._v(" "),a("h3",{attrs:{id:"add-dependency-for-hive"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#add-dependency-for-hive"}},[e._v("#")]),e._v(" Add Dependency For Hive")]),e._v(" "),a("p",[e._v("To use hive-connector in hive, we should add the hive-connector jar into hive.")]),e._v(" "),a("p",[e._v("After downloading the code of iotdb from "),a("a",{attrs:{href:"https://github.com/apache/iotdb",target:"_blank",rel:"noopener noreferrer"}},[e._v("https://github.com/apache/iotdb"),a("OutboundLink")],1),e._v(", you can use the command of "),a("code",[e._v("mvn clean package -pl hive-connector -am -Dmaven.test.skip=true -P get-jar-with-dependencies")]),e._v(" to get a "),a("code",[e._v("hive-connector-X.X.X-jar-with-dependencies.jar")]),e._v(".")]),e._v(" "),a("p",[e._v("Then in hive, use the command of "),a("code",[e._v("add jar XXX")]),e._v(" to add the dependency. For example:")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("hive> add jar /Users/hive/iotdb/hive-connector/target/hive-connector-0.13.0-SNAPSHOT-jar-with-dependencies.jar;\n\nAdded [/Users/hive/iotdb/hive-connector/target/hive-connector-0.13.0-SNAPSHOT-jar-with-dependencies.jar] to class path\nAdded resources: [/Users/hive/iotdb/hive-connector/target/hive-connector-0.13.0-SNAPSHOT-jar-with-dependencies.jar]\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br")])]),a("h3",{attrs:{id:"create-tsfile-backed-hive-tables"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#create-tsfile-backed-hive-tables"}},[e._v("#")]),e._v(" Create Tsfile-backed Hive tables")]),e._v(" "),a("p",[e._v("To create a Tsfile-backed table, specify the "),a("code",[e._v("serde")]),e._v(" as "),a("code",[e._v("org.apache.iotdb.hive.TsFileSerDe")]),e._v(",\nspecify the "),a("code",[e._v("inputformat")]),e._v(" as "),a("code",[e._v("org.apache.iotdb.hive.TSFHiveInputFormat")]),e._v(",\nand the "),a("code",[e._v("outputformat")]),e._v(" as "),a("code",[e._v("org.apache.iotdb.hive.TSFHiveOutputFormat")]),e._v(".")]),e._v(" "),a("p",[e._v("Also provide a schema which only contains two fields: "),a("code",[e._v("time_stamp")]),e._v(" and "),a("code",[e._v("sensor_id")]),e._v(" for the table.\n"),a("code",[e._v("time_stamp")]),e._v(" is the time value of the time series\nand "),a("code",[e._v("sensor_id")]),e._v(" is the sensor name to extract from the tsfile to hive such as "),a("code",[e._v("sensor_1")]),e._v(".\nThe name of the table can be any valid table names in hive.")]),e._v(" "),a("p",[e._v("Also a location provided for hive-connector to pull the most current data for the table.")]),e._v(" "),a("p",[e._v("The location should be a specific directory on your local file system or HDFS to set up Hadoop.\nIf it is in your local file system, the location should look like "),a("code",[e._v("file:///data/data/sequence/root.baic2.WWS.leftfrontdoor/")])]),e._v(" "),a("p",[e._v("Last, set the "),a("code",[e._v("device_id")]),e._v(" in "),a("code",[e._v("TBLPROPERTIES")]),e._v(" to the device name you want to analyze.")]),e._v(" "),a("p",[e._v("For example:")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("CREATE EXTERNAL TABLE IF NOT EXISTS only_sensor_1(\n  time_stamp TIMESTAMP,\n  sensor_1 BIGINT)\nROW FORMAT SERDE 'org.apache.iotdb.hive.TsFileSerDe'\nSTORED AS\n  INPUTFORMAT 'org.apache.iotdb.hive.TSFHiveInputFormat'\n  OUTPUTFORMAT 'org.apache.iotdb.hive.TSFHiveOutputFormat'\nLOCATION '/data/data/sequence/root.baic2.WWS.leftfrontdoor/'\nTBLPROPERTIES ('device_id'='root.baic2.WWS.leftfrontdoor.plc1');\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br"),a("span",{staticClass:"line-number"},[e._v("8")]),a("br"),a("span",{staticClass:"line-number"},[e._v("9")]),a("br")])]),a("p",[e._v("In this example, the data of "),a("code",[e._v("root.baic2.WWS.leftfrontdoor.plc1.sensor_1")]),e._v(" is pulled from the directory of "),a("code",[e._v("/data/data/sequence/root.baic2.WWS.leftfrontdoor/")]),e._v(".\nThis table results in a description as below:")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("hive> describe only_sensor_1;\nOK\ntime_stamp          \ttimestamp              \tfrom deserializer\nsensor_1            \tbigint              \tfrom deserializer\nTime taken: 0.053 seconds, Fetched: 2 row(s)\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br")])]),a("p",[e._v("At this point, the Tsfile-backed table can be worked with in Hive like any other table.")]),e._v(" "),a("h3",{attrs:{id:"query-from-tsfile-backed-hive-tables"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#query-from-tsfile-backed-hive-tables"}},[e._v("#")]),e._v(" Query from TsFile-backed Hive tables")]),e._v(" "),a("p",[e._v("Before we do any queries, we should set the "),a("code",[e._v("hive.input.format")]),e._v(" in hive by executing the following command.")]),e._v(" "),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("hive> set hive.input.format=org.apache.hadoop.hive.ql.io.HiveInputFormat;\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br")])]),a("p",[e._v("Now, we already have an external table named "),a("code",[e._v("only_sensor_1")]),e._v(" in hive.\nWe can use any query operations through HQL to analyse it.")]),e._v(" "),a("p",[e._v("For example:")]),e._v(" "),a("h4",{attrs:{id:"select-clause-example"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#select-clause-example"}},[e._v("#")]),e._v(" Select Clause Example")]),e._v(" "),a("div",{staticClass:"language- 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"),a("div",{staticClass:"language- line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-text"}},[a("code",[e._v("hive> select count(*) from only_sensor_1;\nWARNING: Hive-on-MR is deprecated in Hive 2 and may not be available in the future versions. Consider using a different execution engine (i.e. spark, tez) or using Hive 1.X releases.\nQuery ID = jackietien_20191016202416_d1e3e233-d367-4453-b39a-2aac9327a3b6\nTotal jobs = 1\nLaunching Job 1 out of 1\nNumber of reduce tasks determined at compile time: 1\nIn order to change the average load for a reducer (in bytes):\n  set hive.exec.reducers.bytes.per.reducer=<number>\nIn order to limit the maximum number of reducers:\n  set hive.exec.reducers.max=<number>\nIn order to set a constant number of reducers:\n  set mapreduce.job.reduces=<number>\nJob running in-process (local Hadoop)\n2019-10-16 20:24:18,305 Stage-1 map = 0%,  reduce = 0%\n2019-10-16 20:24:27,443 Stage-1 map = 100%,  reduce = 100%\nEnded Job = job_local867757288_0002\nMapReduce Jobs Launched:\nStage-Stage-1:  HDFS Read: 0 HDFS Write: 0 SUCCESS\nTotal MapReduce CPU Time Spent: 0 msec\nOK\n1000000\nTime taken: 11.334 seconds, Fetched: 1 row(s)\n")])]),e._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[e._v("1")]),a("br"),a("span",{staticClass:"line-number"},[e._v("2")]),a("br"),a("span",{staticClass:"line-number"},[e._v("3")]),a("br"),a("span",{staticClass:"line-number"},[e._v("4")]),a("br"),a("span",{staticClass:"line-number"},[e._v("5")]),a("br"),a("span",{staticClass:"line-number"},[e._v("6")]),a("br"),a("span",{staticClass:"line-number"},[e._v("7")]),a("br"),a("span",{staticClass:"line-number"},[e._v("8")]),a("br"),a("span",{staticClass:"line-number"},[e._v("9")]),a("br"),a("span",{staticClass:"line-number"},[e._v("10")]),a("br"),a("span",{staticClass:"line-number"},[e._v("11")]),a("br"),a("span",{staticClass:"line-number"},[e._v("12")]),a("br"),a("span",{staticClass:"line-number"},[e._v("13")]),a("br"),a("span",{staticClass:"line-number"},[e._v("14")]),a("br"),a("span",{staticClass:"line-number"},[e._v("15")]),a("br"),a("span",{staticClass:"line-number"},[e._v("16")]),a("br"),a("span",{staticClass:"line-number"},[e._v("17")]),a("br"),a("span",{staticClass:"line-number"},[e._v("18")]),a("br"),a("span",{staticClass:"line-number"},[e._v("19")]),a("br"),a("span",{staticClass:"line-number"},[e._v("20")]),a("br"),a("span",{staticClass:"line-number"},[e._v("21")]),a("br"),a("span",{staticClass:"line-number"},[e._v("22")]),a("br")])])])}),[],!1,null,null,null);t.default=n.exports}}]);