[CASSANDRA-17225] Add a virtual table for exposing batch metrics

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

Source Control Link

https://github.com/apache/cassandra/commit/ce7502a11067ef903cba24ad588cf0a5b9da9257

Test and Documentation Plan

The patch add new unit tests

• Assignee: Michael Burman
• Reporter: Benjamin Lerer

Authors

Michael Burman

Reviewers

Aleksei Zotov, Benjamin Lerer, Ekaterina Dimitrova

• Created: 21/Dec/21 09:50
• Updated: 27/May/22 19:25
• Resolved: 10/Feb/22 08:55

Description

There are some existing metrics within BatchMetrics that provide metrics about related to the different types of Batches being executed. We should expose those through a virtual table.

Additional information for newcomers:

A new class should be created for representing the new Virtual Table in org.apache.cassandra.db.virtual. You can look at ThreadPoolsTable for an example of virtual table implementation and to TableMetricTables for how Histogram metrics can be exposed. The new table will need to be registered in SystemViewsKeyspace.
Some unit tests should be added. For some example of virtual table tests you can look at SystemPropertiesTableTest.

Issue Links

• links to: PR #1372