Secure Spark connections

Communication between Spark applications and transactional nodes, masters and workers, and intercommunication between Spark drivers and executors can be encrypted. Encryption must be configured individually on each node in the cluster.

The location of the cassandra.yaml file depends on the type of installation:

Package installations
Tarball installations

/etc/hcd/cassandra/cassandra.yaml

<installation_location>/resources/cassandra/conf/cassandra.yaml

Encryption between Spark applications, including between the Spark master and worker nodes, is configured by enabling Spark security in the hcd.yaml file.

Encryption between the Spark driver and executors in client applications is configured by enabling Spark security in the application configuration properties, or by default in spark-defaults.conf and spark-daemon-defaults.conf in the Spark configuration directory.

The default location of the Spark configuration files depends on the type of installation:

Package installations: /etc/hcd/spark/
Tarball installations: <installation_location>/resources/spark/conf

Use the hcd.yaml configuration file to enable Spark security

Locate the hcd.yaml configuration file. The location of this file depends on the type of installation:
- Package installations
- Tarball installations
/etc/hcd/hcd.yaml

<installation_location>/resources/cassandra/conf/cassandra.yaml
Enable mutual authentication and encryption between Spark master and worker nodes in the hcd.yaml file.
```
spark_security_enabled: true
spark_security_encryption_enabled: true
```
To enable encryption, you must also enable mutual authentication.
To encrypt communication between the Spark application and master, HCD inherits the client to cluster connection encryption options. To enable SSL security separately from HCD client-to-cluster encryption, change the settings in the cassandra.yaml file under spark_ui_options. Set encryption to custom, then set the keystore settings in encryption_options.

The Spark web UI server automatically discards all cipher algorithms that end with a suffix SHA, SHA1 or MD5. If you manually specify cipher suites for encryption, make sure the specified cipher suites are not ignored by the server and are supported by the web browsers used to access the Spark web UI. For example, two 256 bit cipher suites that are supported by both the server and current web browsers are TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 and TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384.

For each Spark application, set the following client encryption options to true in the spark-defaults.conf file to enable encryption between the Spark driver and executors.

Option Description

Option	Description
`spark.authenticate`	Enables or disables mutual authentication using a secret key. The default is `false`.
`spark.authenticate.enableSaslEncryption`	Enables or disables SASL encryption between a Spark driver and its executors. The default is `false`.
`spark.io.encryption.enabled`	Enables or disables encryption for data stored by drivers directly on disk.

spark.authenticate

Enables or disables mutual authentication using a secret key. The default is false.

spark.authenticate.enableSaslEncryption

Enables or disables SASL encryption between a Spark driver and its executors. The default is false.

spark.io.encryption.enabled

Enables or disables encryption for data stored by drivers directly on disk.

To enable encryption by default for all Spark applications, modify the options in the spark-defaults.conf file in the Spark configuration directory. To encrypt data stored on the server by default, modify the options in the spark-daemon-defaults.conf file.

Option Description

Option	Description
`spark.io.encryption.enabled`	Enables or disables encryption for data stored by executors and shuffle services directly on disk.

spark.io.encryption.enabled

Enables or disables encryption for data stored by executors and shuffle services directly on disk.

Secure Spark connections

Use the hcd.yaml configuration file to enable Spark security

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