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Query Apache Hive from R using JDBC
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| # Copyright 2018 Cloudera, Inc. | |
| # | |
| # Licensed under the Apache License, Version 2.0 (the "License"); | |
| # you may not use this file except in compliance with the License. | |
| # You may obtain a copy of the License at | |
| # | |
| # http://www.apache.org/licenses/LICENSE-2.0 | |
| # | |
| # Unless required by applicable law or agreed to in writing, software | |
| # distributed under the License is distributed on an "AS IS" BASIS, | |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| # See the License for the specific language governing permissions and | |
| # limitations under the License. | |
| # first install the Hive JDBC driver | |
| # from https://www.cloudera.com/downloads/connectors/hive/jdbc.html | |
| # set jdbc_path to the path to the folder containing the JAR files | |
| # extracted from the JDBC41 zip file in the JDBC driver package | |
| jdbc_path <- "PATH TO FOLDER CONTAINING JAR FILES HERE" | |
| # set the Hive JDBC connection string | |
| jdbc_conn_str <- "jdbc:hive2://HOSTNAME:10000" | |
| # install the RJDBC package if it's not already installed | |
| if(!"RJDBC" %in% rownames(installed.packages())) { | |
| install.packages("RJDBC") | |
| } | |
| # initialize rJava | |
| hive_classpath <- list.files(path = jdbc_path, pattern = "\\.jar$", full.names = TRUE) | |
| rJava::.jinit(classpath = hive_classpath) | |
| # connect to HiveServer2 | |
| library(DBI) | |
| drv <- RJDBC::JDBC("com.cloudera.hive.jdbc41.Driver", hive_classpath, "`") | |
| hive <- dbConnect(drv, jdbc_conn_str) | |
| # now you can run SELECT queries and return the results to R | |
| # using the dbGetQuery() function | |
| # for example: | |
| dbGetQuery( | |
| hive, | |
| "SELECT origin, | |
| COUNT(*) AS num_departures, | |
| AVG(dep_delay) AS avg_dep_delay | |
| FROM flights | |
| WHERE dest = 'LAS' | |
| GROUP BY origin | |
| ORDER BY avg_dep_delay") | |
| # disconnect from Hive | |
| dbDisconnect(hive) |
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