对ODS层数据进行清洗（去除空值，脏数据，超过极限范围的数据，行式存储改为列存储，改压缩格式）。
9.1 DWD层启动表数据解析
9.1.1 创建启动表
1）建表语句
drop table if exists dwd_start_log;
CREATE EXTERNAL TABLE dwd_start_log(
`mid_id` string,
`user_id` string,
`version_code` string,
`version_name` string,
`lang` string,
`source` string,
`os` string,
`area` string,
`model` string,
`brand` string,
`sdk_version` string,
`gmail` string,
`height_width` string,
`app_time` string,
`network` string,
`lng` string,
`lat` string,
`entry` string,
`open_ad_type` string,
`action` string,
`loading_time` string,
`detail` string,
`extend1` string
)
PARTITIONED BY (dt string)
stored as parquet
location '/warehouse/gmall/dwd/dwd_start_log/'
TBLPROPERTIES('parquet.compression'='lzo');
9.1.2 向启动表导入数据
insert overwrite table dwd_start_log
PARTITION (dt='2020-10-14')
select
get_json_object(line,'$.mid') mid_id,
get_json_object(line,'$.uid') user_id,
get_json_object(line,'$.vc') version_code,
get_json_object(line,'$.vn') version_name,
get_json_object(line,'$.l') lang,
get_json_object(line,'$.sr') source,
get_json_object(line,'$.os') os,
get_json_object(line,'$.ar') area,
get_json_object(line,'$.md') model,
get_json_object(line,'$.ba') brand,
get_json_object(line,'$.sv') sdk_version,
get_json_object(line,'$.g') gmail,
get_json_object(line,'$.hw') height_width,
get_json_object(line,'$.t') app_time,
get_json_object(line,'$.nw') network,
get_json_object(line,'$.ln') lng,
get_json_object(line,'$.la') lat,
get_json_object(line,'$.entry') entry,
get_json_object(line,'$.open_ad_type') open_ad_type,
get_json_object(line,'$.action') action,
get_json_object(line,'$.loading_time') loading_time,
get_json_object(line,'$.detail') detail,
get_json_object(line,'$.extend1') extend1
from ods_start_log
where dt='2020-10-14';
2）测试
select * from dwd_start_log limit 2;
9.1.3 DWD层启动表加载数据脚本
1）在hadoop102的/home/kgg/bin目录下创建脚本
[kgg@hadoop102 bin]$ vim dwd_start_log.sh
在脚本中编写如下内容
2）增加脚本执行权限
[kgg@hadoop102 bin]$ chmod 777 dwd_start_log.sh
3）脚本使用
[kgg@hadoop102 module]$ dwd_start_log.sh 2019-02-11
4）查询导入结果
select * from dwd_start_log where dt='2019-02-11' limit 2;
5）脚本执行时间
企业开发中一般在每日凌晨30分~1点
9.2 DWD层事件表数据解析
9.2.1 创建基础明细表
明细表用于存储ODS层原始表转换过来的明细数据。
1）创建事件日志基础明细表
drop table if exists dwd_base_event_log;
CREATE EXTERNAL TABLE dwd_base_event_log(
`mid_id` string,
`user_id` string,
`version_code` string,
`version_name` string,
`lang` string,
`source` string,
`os` string,
`area` string,
`model` string,
`brand` string,
`sdk_version` string,
`gmail` string,
`height_width` string,
`app_time` string,
`network` string,
`lng` string,
`lat` string,
`event_name` string,
`event_json` string,
`server_time` string)
PARTITIONED BY (`dt` string)
stored as parquet
location '/warehouse/gmall/dwd/dwd_base_event_log/'
TBLPROPERTIES('parquet.compression'='lzo');
2）说明
其中event_name和event_json用来对应事件名和整个事件。这个地方将原始日志1对多的形式拆分出来了。操作的时候我们需要将原始日志展平，需要用到UDF和UDTF。
9.2.2 自定义UDF函数（解析公共字段）
1）创建一个maven工程：hivefunction 2）创建包名：com.kgg.udf 3）在pom.xml文件中添加如下内容
<properties>
<project.build.sourceEncoding>UTF8</project.build.sourceEncoding>
<hive.version>1.2.1</hive.version>
</properties>
<dependencies>
<!--添加hive依赖-->
<dependency>
<groupId>org.apache.hive</groupId>
<artifactId>hive-exec</artifactId>
<version>${hive.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
4）UDF用于解析公共字段
package com.kgg.udf;
import org.apache.commons.lang.StringUtils;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.json.JSONException;
import org.json.JSONObject;
public class BaseFieldUDF extends UDF {
public String evaluate(String line, String key) throws JSONException {
// 1 处理line 服务器时间 | json
String[] log = line.split("\\|");
//2 合法性校验
if (log.length != 2 || StringUtils.isBlank(log[1])) {
return "";
}
// 3 开始处理json
JSONObject baseJson = new JSONObject(log[1].trim());
String result = "";
// 4 根据传进来的key查找相应的value
if ("et".equals(key)) {
if (baseJson.has("et")) {
result = baseJson.getString("et");
}
} else if ("st".equals(key)) {
result = log[0].trim();
} else {
JSONObject cm =“” baseJson.getJSONObject("cm");
if (cm.has(key)) {
result = cm.getString(key);
}
}
return result;
}
public static void main(String[] args) throws JSONException {
String line = "1541217850324|{"cm":{"mid":"m7856","uid":"u8739","ln":"-74.8","sv":"V2.2.2","os":"8.1.3","g":"P7XC9126