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How to  Import From Mysql to Avro with Impala

Posted by BDD Talend Practice
Category:

avro

This blog explains how to Import from Mysql to Avro with Impala and and Hive Query

Command Line for Sqoop :

[cloudera@quickstart ~]$ sqoop import-all-tables \
-m 1 \
–connect jdbc:mysql://quickstart:3306/retail_db \
–username=retail_dba \
–password=cloudera \
–compression-codec=snappy \
–as-avrodatafile \
–warehouse-dir=/user/hive/warehouse

 

When this command is complete, confirm that your Avro data files exist in HDFS.

[cloudera@quickstart ~]$ hadoop fs -ls /user/hive/warehouse

 

Sqoop should also have created schema files for this data in your home directory.
Avro schema files:

[cloudera@quickstart ~]$ ls -l *.avsc

 

Apache Hive will need the schema files too, so let’s copy them into HDFS where Hive can easily access them.

[cloudera@quickstart ~]$ sudo -u hdfs hadoop fs -mkdir /user/examples
[cloudera@quickstart ~]$ sudo -u hdfs hadoop fs -chmod +rw /user/examples
[cloudera@quickstart ~]$ hadoop fs -copyFromLocal ~/*.avsc /user/examples/

With Impala, import all this schema avro tables

CREATE EXTERNAL TABLE categories STORED AS AVRO
LOCATION ‘hdfs:///user/hive/warehouse/categories’
TBLPROPERTIES (‘avro.schema.url’=’hdfs://quickstart/user/examples/sqoop_import_categories.avsc’);

CREATE EXTERNAL TABLE customers STORED AS AVRO
LOCATION ‘hdfs:///user/hive/warehouse/customers’
TBLPROPERTIES (‘avro.schema.url’=’hdfs://quickstart/user/examples/sqoop_import_customers.avsc’);

CREATE EXTERNAL TABLE departments STORED AS AVRO
LOCATION ‘hdfs:///user/hive/warehouse/departments’
TBLPROPERTIES (‘avro.schema.url’=’hdfs://quickstart/user/examples/sqoop_import_departments.avsc’);

CREATE EXTERNAL TABLE orders STORED AS AVRO
LOCATION ‘hdfs:///user/hive/warehouse/orders’
TBLPROPERTIES (‘avro.schema.url’=’hdfs://quickstart/user/examples/sqoop_import_orders.avsc’);

CREATE EXTERNAL TABLE order_items STORED AS AVRO
LOCATION ‘hdfs:///user/hive/warehouse/order_items’
TBLPROPERTIES (‘avro.schema.url’=’hdfs://quickstart/user/examples/sqoop_import_order_items.avsc’);

CREATE EXTERNAL TABLE products STORED AS AVRO
LOCATION ‘hdfs:///user/hive/warehouse/products’
TBLPROPERTIES (‘avro.schema.url’=’hdfs://quickstart/user/examples/sqoop_import_products.avsc’);

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