How create Hive external table using Sqoop?

Posted on by Muna Meyer

How create Hive external table using Sqoop?

Step 1: import data from mysql to hive table. Step 2: In hive change the table type from Managed to External….3 Answers

  1. Modify the generated SQL to create a Hive external table.
  2. Execute the modified SQL in Hive.
  3. Run your Sqoop import command, loading into the pre-created Hive external table.

Can Sqoop create Hive table?

Sqoop can generate a hive table (using create-hive-table command) based on the table from an existing relational data source. If set, then the job will fail if the target hive table exists.

How do I load data into Hive using Sqoop?

How to Import Data From MySQL to Hive Using Sqoop

  1. 1.1 I. Check MySQL Table emp.
  2. 1.2 II. Now write the Sqoop import scripts to import MySQL data into Hive.
  3. 1.3 III. Check the file in HDFS.
  4. 1.4 IV. Verify the number of records.
  5. 1.5 V. Check the imported records in HDFS.
  6. 1.6 VI. Verify data in Hive.
  7. 1.7 Conclusion.

How do I create a Sqoop database?

For example, to connect to a SQLServer database, first download the driver from microsoft.com and install it in your Sqoop lib path. Then run Sqoop. For example: $ sqoop import –driver com….Table 2. Import control arguments:

Argument Description
–table Table to read
–target-dir HDFS destination dir

Can we ingest the file using Sqoop into Hive table?

You can use Sqoop to import data into HDFS or directly into Hive. However, Sqoop can only import data into Hive as a text file or as a SequenceFile….Table 1.6. Sqoop Command Options for Importing Data into Hive.

Sqoop Command Option Description
–hive-overwrite Overwrites existing data in the Hive table.

Does Sqoop job involve both map and reduce?

Or is there any case in Sqoop where both mappers and reducers run? Documentation specifies that each map task will need to execute a copy of the query, with results partitioned by bounding conditions inferred by Sqoop.

How do I create a Sqoop script?

Sqoop-import can use either a last-modified timestamp, or an always-increasing row ID to decide which rows to import. You need to provide a –last-value parameter. You could store the last value in between jobs, or maybe retrieve it from your Impala database before running the job.

How do I run a Sqoop script?

Executing as shell script

  1. vi sqoop_eval.sh and write the above sqoop eval command in the file.
  2. chmod +x sqoop_eval.sh (This command is giving execute permissions to the file)
  3. ./sqoop_eval.sh (This command is used to execute the shell-script)

How do I import data into Hive?

Execute a Sqoop import command that specifies the Sqoop connection to the RDBMS, the data you want to import, and the destination Hive table name. This command imports the MySQL EMPLOYEES table to a new Hive table named in the default HDFS location /user/hive/warehouse.

What is staging table in Sqoop?

Data will be first loaded into staging table. If there are no exceptions then data will be copied from staging table into the target table. If data in staging table is not cleaned up for any reason, we might have to use additional control argument –clear-staging-table .

Can you write the syntax for sqoop import?

Sqoop tool ‘import’ is used to import table data from the table to the Hadoop file system as a text file or a binary file. The following command is used to import the emp table from MySQL database server to HDFS. SqlManager: Executing SQL statement: SELECT t. * FROM `emp` AS t LIMIT 1 14/12/22 15:24:58 INFO manager.

How do I import first 10 records from a RDBMS table into HDFS using sqoop?

The Sqoop import is a tool that imports an individual table from the relational database to the Hadoop Distributed File System….Sqoop Import Syntax.

Argument Description
–driver Manually specify the JDBC driver class to use
–hadoop-mapred-home Override $HADOOP_MAPRED_HOME