Sage-Tips

How do I import a CSV file into HDFS?

2 Answers

1. move csv file to hadoop sanbox (/home/username) using winscp or cyberduck.
2. use -put command to move file from local location to hdfs. hdfs dfs -put /home/username/file.csv /user/data/file.csv.

Can Hadoop read csv file?

FSDataInputStream has several read methods. Choose the one which suits your needs. If you want to use mapreduce you can use TextInputFormat to read line by line and parse each line in mapper’s map function. Other option is to develop (or find developed) CSV input format for reading data from file.

How do I import a CSV file from HDFS to hive?

Load CSV file in hive

1. Step 1: Sample CSV File. Create a sample CSV file named as sample_1.
2. Step 2: Copy CSV to HDFS. Run the below commands in the shell for initial setup.
3. Step 3: Create Hive Table and Load data. Now, you have the file in Hdfs, you just need to create an external table on top of it.
4. Step 4: Verify data.

How do I load files into HDFS?

Inserting Data into HDFS

1. You have to create an input directory. $ $HADOOP_HOME/bin/hadoop fs -mkdir /user/input.
2. Transfer and store a data file from local systems to the Hadoop file system using the put command. $ $HADOOP_HOME/bin/hadoop fs -put /home/file.txt /user/input.
3. You can verify the file using ls command.

Which command will load data from csv file stored on HDFS into Hive table?

Use the LOAD DATA command to load the data files like CSV into Hive Managed or External table.

How to convert CSV file to HDFS file?

Solution 1 Sample CSV File. Create a sample CSV file named as sample_1.csv. 2 Copy CSV to HDFS. Run the below commands in the shell for initial setup. 3 Create Hive Table and Load data. Now, you have the file in Hdfs, you just need to create an external table on top of it. 4 Verify data. CSV is the most used file format.

How do I import data from a CSV file?

Note: The values in stored generated columns are not exported. The process to import data from CSV files includes the following steps: Export your data to CSV files and store those files in Cloud Storage. Do not include a header line. Create a JSON manifest file and store the file along with your CSV files.

How do I import data from CSV to Cloud Spanner?

Create a JSON manifest file and store the file along with your CSV files. Create empty target tables in your Cloud Spanner database or ensure that the data types for columns in your CSV files match any corresponding columns in your existing tables.

How can I perform high-performance database imports in HDFS?

However, by using database-specific data movement tools, some databases can perform imports in a more high-performance fashion. In addition, inside your home directory in HDFS, Sqoop will import a table named foo to a directory named foo. For example, the Sqoop import tool will write to /user/someuser/foo/ (files) if your username is some user.