一尘不染

使用Hive将数据插入Hbase(JSON文件)

json

我已经使用hive在hbase中创建了一个表:

hive> CREATE TABLE hbase_table_emp(id int, name string, role string) 
STORED BY 'org.apache.hadoop.hive.hbase.HBaseStorageHandler'
WITH SERDEPROPERTIES ("hbase.columns.mapping" = ":key,cf1:name,cf1:role")
TBLPROPERTIES ("hbase.table.name" = "emp");

并创建了另一个表来加载数据:

hive> create table testemp(id int, name string, role string) row format delimited fields terminated by '\t';
hive> load data local inpath '/home/user/sample.txt' into table testemp;

最后将数据插入到hbase表中:

hive> insert overwrite table hbase_table_emp select * from testemp;
hive> select * from hbase_table_emp;
OK
123 Ram     TeamLead
456 Silva   Member
789 Krishna Member
time taken: 0.160 seconds, Fetched: 3 row(s)

该表在hbase中如下所示:

hbase(main):002:0> scan 'emp'
ROW                   COLUMN+CELL                                               
 123                  column=cf1:name, timestamp=1422540225254, value=Ram       
 123                  column=cf1:role, timestamp=1422540225254, value=TeamLead  
 456                  column=cf1:name, timestamp=1422540225254, value=Silva     
 456                  column=cf1:role, timestamp=1422540225254, value=Member    
 789                  column=cf1:name, timestamp=1422540225254, value=Krishna      
 789                  column=cf1:role, timestamp=1422540225254, value=Member    
3 row(s) in 2.1230 seconds

我可以对JSON文件做同样的事情:

 {"id": 123, "name": "Ram", "role":"TeamLead"}
 {"id": 456, "name": "Silva", "role":"Member"}
 {"id": 789, "name": "Krishna", "role":"Member"}

并做:

hive> load data local inpath '/home/user/sample.json' into table testemp;

请帮忙 !:)


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2020-07-27

共1个答案

一尘不染

您可以使用该get_json_object函数将数据解析为JSON对象。例如,如果您使用JSON数据创建登台表:

DROP TABLE IF EXISTS staging;
CREATE TABLE staging (json STRING);
LOAD DATA LOCAL INPATH '/local/path/to/jsonfile' INTO TABLE staging;

然后使用get_json_object提取要加载到表中的属性:

INSERT OVERWRITE TABLE hbase_table_emp SELECT
  get_json_object(json, "$.id") AS id,
  get_json_object(json, "$.name") AS name,
  get_json_object(json, "$.role") AS role
FROM staging;

有此功能的更全面的讨论在这里

2020-07-27