[CASSANDRA-13642] Expose recent histograms in JmxHistograms

• Type: Improvement
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 4.0-alpha1, 4.0
• Component/s: Legacy/Observability
• Assignee: Chris Lohfink
• Reporter: Chris Lohfink

Authors

Chris Lohfink

Reviewers

Jeremiah Jordan

• Created: 27/Jun/17 19:06
• Updated: 02/Jun/21 18:25
• Resolved: 04/Oct/17 17:31

Description

For monitoring tools that were written for the recent*Histograms the current decaying and all time values exposed by the JmxHistograms is not consumable. We can add a new attribute (easier with some tooling than operations to read) to expose it just like in storage service previously.

Should additionally make it so this attribute only stores previous values if read, so that it does not add any additional memory cost to C* unless used since we already storing 2 versions of histogram for the decaying/alltime views.

Issue Links

• relates to: CASSANDRA-16707 JmxHistogram#getRecentValues() is not thread-safe
• links to: GitHub Pull Request #126