impala数据插入的方法详解

impala是一种内存计算的数据库，查询性能相比于hive官网称是快100倍，其向表中插入数据的方法如下：

 

１、insert into

[slave12:21000] > insert into parquet_snappy select * from raw_text_data;
Inserted 1000000000 rows in 181.98s

 

2、CTAS

 

[slave12:21000] > create table test_table  STORED AS PARQUET as select * from table;
Query: create table test_table  STORED AS PARQUET as select * from table
+-------------------------+
| summary                 |
+-------------------------+
| Inserted 80000 row(s) |
+-------------------------+

3、load data 

 

[slave12:21000] > load data inpath '/user/hive/warehouse/test.db/table' into table test_table;
Query: load data inpath '/user/hive/warehouse/test.db/table' into table test_table
+----------------------------------------------------------+
| summary                                                  |
+----------------------------------------------------------+
| Loaded 1 file(s). Total files in destination location: 1 |
+----------------------------------------------------------+

 

此处注意，此种方法只能导入hdfs上的文件，不支持导入本地文件，不能像hive一样，加入local去导入本地文件，同时load之后，原表需要refresh，否则会报错