/*
* Copyright 2011-2012 the original author or authors.
*
* 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.
*/
package com.springdeveloper.hadoop.hive;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.JdbcTemplate;
public class HiveJdbcApp {
private static final Log log = LogFactory.getLog(HiveJdbcApp.class);
public static void main(String[] args) throws Exception {
AbstractApplicationContext context = new ClassPathXmlApplicationContext(
"/META-INF/spring/hive-jdbc-context.xml", HiveJdbcApp.class);
log.info("Hive JDBC Application Running");
context.registerShutdownHook();
String tableDdl = "create external table if not exists tweetdata (value STRING) LOCATION '/tweets/input'";
String query = "select r.retweetedUser, '\t', count(r.retweetedUser) as count " +
" from tweetdata j " +
" lateral view json_tuple(j.value, 'retweet', 'retweetedStatus') t as retweet, retweetedStatus " +
" lateral view json_tuple(t.retweetedStatus, 'fromUser') r as retweetedUser " +
" where t.retweet = 'true' " +
" group by r.retweetedUser order by count desc limit 10";
String results = "insert overwrite directory '/tweets/hiveout'";
JdbcTemplate template = context.getBean(JdbcTemplate.class);
template.execute(tableDdl);
template.execute(results + " " + query);
context.close();
}
}