Where do I find sqoop logs?
Table of Contents
- 1 Where do I find sqoop logs?
- 2 What is the default mapper in sqoop?
- 3 What is the default table in hive?
- 4 What are the default number of mappers and reducers in the sqoop?
- 5 How one can work with different file formats using Apache sqoop?
- 6 What are the different file formats in Hive?
- 7 What is the default file format to import data using Sqoop?
- 8 What is an options file in Sqoop?
Where do I find sqoop logs?
You can view these logs through the Yarn UIs (usually on port 8088. e.g. http://example.com:8088) or through Hue (http://gethue.com/).
What is the default database for sqoop metadata?
You can use Sqoop to import data from a relational database management system (RDBMS) such as MySQL or Oracle or a mainframe into the Hadoop Distributed File System (HDFS), transform the data in Hadoop MapReduce, and then export the data back into an RDBMS.
What is the default mapper in sqoop?
mapper 4
when we don’t mention the number of mappers while transferring the data from RDBMS to HDFS file system sqoop will use default number of mapper 4.
What is the default file format to import data using Apache sqoop?
text file format
Default file type is text file format. It is same as specifying –as-textfile clause to sqoop import command.
What is the default table in hive?
Hive Internal Table
Hive Internal Table. Hive owns the data for the internal tables. It is the default table in Hive. When the user creates a table in Hive without specifying it as external, then by default, an internal table gets created in a specific location in HDFS.
Which database is not supported by Sqoop?
Even though the JDBC is the compatibility layer that allows the program to access different databases through the common API. But due to the minor differences in the SQL language of each database, we cannot use Sqoop with every database out of the box.
What are the default number of mappers and reducers in the sqoop?
4
How many default mappers and reducers in sqoop? (4-mappers, 0-reducers).
What is number of mappers in sqoop?
By default, sqoop export uses 4 threads or number of mappers to export the data. However, we might have to use different number of mappers based on the size of data that need to be exported. As our data have only 364 records, we will try to export the data using o mapper.
How one can work with different file formats using Apache sqoop?
Using Sqoop, data can be imported to HDFS in Avro and Parquet file formats. Using Sqoop, Avro, and Parquet file format can be exported to RDBMS.
What is stored as textfile in Hive?
TEXTFILE format is a famous input/output format used in Hadoop. In Hive if we define a table as TEXTFILE it can load data of from CSV (Comma Separated Values), delimited by Tabs, Spaces, and JSON data. By default, if we use TEXTFILE format then each line is considered as a record.
What are the different file formats in Hive?
Hive Data Formats
| File Format | Description | Profile |
|---|---|---|
| TextFile | Flat file with data in comma-, tab-, or space-separated value format or JSON notation. | Hive, HiveText |
| SequenceFile | Flat file consisting of binary key/value pairs. | Hive |
| RCFile | Record columnar data consisting of binary key/value pairs; high row compression rate. | Hive, HiveRC |
Can Sqoop import data from NoSQL database?
Sqoop allows easy import and export of data from structured data stores such as relational databases, enterprise data warehouses, and NoSQL systems. …
What is the default file format to import data using Sqoop?
Delimited Text File Format: This is default file format to import data using sqoop. This file format can be explicitly specified using the –as-text file argument to the import command in Sqoop. Free counselling session with data science experts. Apply now. Start your career in data science and AI.
Where can I find the source code for Sqoop?
Software development for Sqoop occurs at http://sqoop.apache.org At that site you can obtain: New releases of Sqoop as well as its most recent source code An issue tracker A wiki that contains Sqoop documentation
What is an options file in Sqoop?
When using Sqoop, the command line options that do not change from invocation to invocation can be put in an options file for convenience. An options file is a text file where each line identifies an option in the order that it appears otherwise on the command line.
How to import data from SQL to Hadoop using Sqoop?
Apache Sqoop uses text file format as the default file format for importing the data from SQL to Hadoop. Moreover, Sqoop supports following file format for import operation: Please find below a sample Sqoop import command using one of the above file formats: