[CASSANDRA-16378] Expose application_name and application_version in virtual table system_views.clients

• Type: Improvement
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 4.1-alpha1, 4.1
• Component/s: Feature/Virtual Tables
• Labels: AdventCalendar2021 gsoc2021 lhf mentor
• Change Category: Operability
• Complexity: Low Hanging Fruit
• Platform: All

Source Control Link

• https://github.com/apache/cassandra/commit/537d02d25f1953f1907d44106f83874ac73e06b4

Test and Documentation Plan

The patch add some new unit tests

• Assignee: Tibor Repasi
• Reporter: Tibor Repasi

Authors

Tibor Repasi

Reviewers

Benjamin Lerer, Berenguer Blasi, Ekaterina Dimitrova

• Created: 11/Jan/21 13:27
• Updated: 27/Jun/22 22:04
• Resolved: 08/Mar/22 10:16

Description

Recent java-driver's com.datastax.oss.driver.api.core.session.SessionBuilder respects properties ApplicationName and ApplicationVersion.

It would be helpful to expose this information via virtual table system_views.clients and with nodetool clientstats.

Additional information for newcomers:

The drivers can send as part of the STARTUP MESSAGE the APPLICATION_NAME and APPLICATION_VERSION options. Two new volatile fields applicationName and applicationVersion need to be added to ClientState in a similar way to driverName and driverVersion.
The APPLICATION_NAME and APPLICATION_VERSION options need to be retrieved in StartupMessage#execute and passed to the ClientState.
The new application_name and application_version columns need to be added to the system_views.clients represented by the ClientsTable class. The data then need to be retrieved from the ClientState through ConnectedClient.
Some unit tests similat to SettingsTableTest should be added.

Issue Links

• is related to: CASSANDRA-17715 nodetool clientstats - client_options to be exposed by adding a new flag
• is related to: CASSANDRA-17344 Documentation update of virtual table system_views.clients
• links to: PR#1362