How to protect password and username in Spark (such as for JDBC connections/accessing RDBMS databases)?

Question

We have a use case where we need to export data from HDFS to a RDBMS. I saw this example . Here they have store the username and password in the code. Is there any way to hi

Answer 1

As you run the application from console using spark-submit, you can access it through Java API:

Console console = System.console();
char passwordArray[] = console.readPassword("Enter your secret password: ");
account.setPassword(passwordArray);

Answer 2

Setting the password

At the command line as a plaintext spark config:

spark-submit --conf spark.jdbc.password=test_pass ... 

Using environment variable:

export jdbc_password=test_pass_export
spark-submit --conf spark.jdbc.password=$jdbc_password ...

Using spark config properties file:

echo "spark.jdbc.b64password=test_pass_prop" > credentials.properties
spark-submit --properties-file credentials.properties

With base64 encoding to "obfuscate":

echo "spark.jdbc.b64password=$(echo -n test_pass_prop | base64)" > credentials_b64.properties
spark-submit --properties-file credentials_b64.properties

Using the password in code

import java.util.Base64 // for base64
import java.nio.charset.StandardCharsets // for base64
val properties = new java.util.Properties()
properties.put("driver", "com.mysql.jdbc.Driver")
properties.put("url", "jdbc:mysql://mysql-host:3306")
properties.put("user", "test_user")
val password = new String(Base64.getDecoder().decode(spark.conf.get("spark.jdbc.b64password")), StandardCharsets.UTF_8)
properties.put("password", password)
val models = spark.read.jdbc(properties.get("url").toString, "ml_models", properties)

Edit: spark command line interface help docs for --conf and --properties-file:

  --conf PROP=VALUE           Arbitrary Spark configuration property.
  --properties-file FILE      Path to a file from which to load extra properties. If not
                              specified, this will look for conf/spark-defaults.conf.

The properties-file name is arbitrary.