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How to Work With Avro Files

To store data in Avro format, thefollowing parameters should be added to the Sqoop command: The template of a Sqoop command is as follows: Example of Sqoop command for Oracle to dump data to S3: Note that when you run the command the target directory should not exist, otherwise theSqoop command will fail.

If the destination of your data is HDFS, you can use the below command to retrieve the table schema: If the destination of your data is S3, you need to copy the Avro data file to local file system and then retrieve the schema: Avro-tools-1.8.1.jar is a part of Avro Tools that provide CLI interface to work with Avro files.

To create an Avro table in Hive (on Hadoop Cluster or on EMR) you have to provide a table schema location retrieved from the Avro data file: You can also specify a table location in S3:: You can even keep a table schema in S3: The Avro schema for the EMPLOYEE table looks like this: Note that all timestamp columns are defined as long.

No changes occur when creating an Avro table in Hive: When querying the data, you just need to convert milliseconds to string: The resulting dataset without using timestamp conversion looks like this: The resulting dataset using timestamp conversion looks like this: Important: In Hive, if reserved words are used as column names (liketimestamp) you need to use backquotes to escape them: When creating Athena tables, alllongfields should be created asbigintin aCREATE TABLEstatement (not in Avro schema!): When querying the data, you just need to convert milliseconds to string: The resulting dataset without using timestamp conversion looks like this: The resulting dataset using timestamp conversion looks like this: If you do not want to convert the timestamp from Unix time every time you run a query, you can store timestamp values as text by adding the following parameter to Sqoop: After applying this parameter and running Sqoop the table schema will look like this: Note that the timestamp columns in the table schema are defined asstring.

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