(window.webpackJsonp=window.webpackJsonp||[]).push([[301],{696:function(e,t,a){"use strict";a.r(t);var s=a(29),n=Object(s.a)({},(function(){var e=this,t=e._self._c;return t("ContentSlotsDistributor",{attrs:{"slot-key":e.$parent.slotKey}},[t("h2",{attrs:{id:"hadoop-tsfile"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#hadoop-tsfile"}},[e._v("#")]),e._v(" Hadoop-TsFile")]),e._v(" "),t("h3",{attrs:{id:"about-hadoop-tsfile-connector"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#about-hadoop-tsfile-connector"}},[e._v("#")]),e._v(" About Hadoop-TsFile-Connector")]),e._v(" "),t("p",[e._v("TsFile-Hadoop-Connector implements the support of Hadoop for external data sources of Tsfile type. This enables users to read, write and query Tsfile by Hadoop.")]),e._v(" "),t("p",[e._v("With this connector, you can")]),e._v(" "),t("ul",[t("li",[e._v("load a single TsFile, from either the local file system or hdfs, into Hadoop")]),e._v(" "),t("li",[e._v("load all files in a specific directory, from either the local file system or hdfs, into hadoop")]),e._v(" "),t("li",[e._v("write data from Hadoop into TsFile")])]),e._v(" "),t("h3",{attrs:{id:"system-requirements"}},[t("a",{staticClass:"header-anchor",attrs:{href:"#system-requirements"}},[e._v("#")]),e._v(" System Requirements")]),e._v(" "),t("table",[t("thead",[t("tr",[t("th",{staticStyle:{"text-align":"center"}},[e._v("Hadoop Version")]),e._v(" "),t("th",{staticStyle:{"text-align":"center"}},[e._v("Java Version")]),e._v(" "),t("th",{staticStyle:{"text-align":"center"}},[e._v("TsFile Version")])])]),e._v(" "),t("tbody",[t("tr",[t("td",{staticStyle:{"text-align":"center"}},[t("code",[e._v("2.7.3")])]),e._v(" 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deltaObjectIds\n    String[] deviceIds = {"device_1"};\n    TSFInputFormat.setReadDeviceIds(job, deltaObjectIds);\n    // configure reading which measurementIds\n    String[] measurementIds = {"sensor_1", "sensor_2", "sensor_3"};\n    TSFInputFormat.setReadMeasurementIds(job, measurementIds);\n')])]),e._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[e._v("1")]),t("br"),t("span",{staticClass:"line-number"},[e._v("2")]),t("br"),t("span",{staticClass:"line-number"},[e._v("3")]),t("br"),t("span",{staticClass:"line-number"},[e._v("4")]),t("br"),t("span",{staticClass:"line-number"},[e._v("5")]),t("br"),t("span",{staticClass:"line-number"},[e._v("6")]),t("br"),t("span",{staticClass:"line-number"},[e._v("7")]),t("br"),t("span",{staticClass:"line-number"},[e._v("8")]),t("br"),t("span",{staticClass:"line-number"},[e._v("9")]),t("br"),t("span",{staticClass:"line-number"},[e._v("10")]),t("br")])]),t("p",[e._v("And then,the output key and value of mapper 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       Text deltaObjectId = (Text) value.get(new Text("device_id"));\n            long timestamp = ((LongWritable)value.get(new Text("timestamp"))).get();\n            if (timestamp % 100000 == 0) {\n                context.write(deltaObjectId, new MapWritable(value));\n            }\n        }\n    }\n\n    /**\n     * This reducer calculate the average value.\n     */\n    public static class TSReducer extends Reducer<Text, MapWritable, NullWritable, HDFSTSRecord> {\n\n        @Override\n        protected void reduce(Text key, Iterable<MapWritable> values,\n                              Reducer<Text, MapWritable, NullWritable, HDFSTSRecord>.Context context) throws IOException, InterruptedException {\n            long sensor1_value_sum = 0;\n            long sensor2_value_sum = 0;\n            double sensor3_value_sum = 0;\n            long num = 0;\n            for (MapWritable value : values) {\n                num++;\n                sensor1_value_sum += 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