[HBASE-26809] Report client backoff time for server overloaded in ConnectionMetrics

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.6.0, 3.0.0-alpha-4, 2.5.2
• Labels: patch-available
• Assignee: Briana Augenreich
• Reporter: Bryan Beaudreault
• Created: 07/Mar/22 22:16
• Updated: 2 days ago 17:51
• Resolved: 15/Nov/22 20:50

Description

Servers can throw CallQueueTooBigException and CallDroppedException when overloaded. As of HBASE-26807, these can have a configurable extra backoff to allow the server to recover. Depending on the server side queue implementation, different callers may be more or less impacted by server load. It is very useful to measure in the client how much time is spent backing off so we can see which clients are most affected by server overload.

Issue Links

• is blocked by: HBASE-26807 Unify CallQueueTooBigException special pause with CallDroppedException
• links to: GitHub Pull Request #4729
• links to: GitHub Pull Request #4786