[CASSANDRA-11569] Track message latency across DCs

• Type: Improvement
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 3.8
• Component/s: Legacy/Observability
• Assignee: Chris Lohfink
• Reporter: Chris Lohfink

Authors

Chris Lohfink

Reviewers

Carl Yeksigian

• Created: 13/Apr/16 20:14
• Updated: 28/Jan/20 09:06
• Resolved: 16/Jun/16 14:51

Description

Since we have the timestamp a message is created and when arrives, we can get an approximate time it took relatively easy and would remove necessity for more complex hacks to determine latency between DCs.

Although is not going to be very meaningful when ntp is not setup, it is pretty common to have NTP setup and even with clock drift nothing is really hurt except the metric becoming whacky.

Issue Links

• causes: CASSANDRA-15530 Update CHANGES.txt with Add cross-DC latency metrics (CASSANDRA-11569)