[CASSANDRA-9364] Add a warning when a high setting for rpc_max_threads is specified for HSHA

• Type: Improvement
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 2.0.15, 2.1.6
• Assignee: Brandon Williams
• Reporter: Brandon Williams

Authors

Brandon Williams

Reviewers

Jonathan Ellis

• Created: 12/May/15 18:43
• Updated: 16/Apr/19 09:31
• Resolved: 12/May/15 19:42

Description

In CASSANDRA-7594 we allowed configuring this. The problem is this was ignored for HSHA previously, so some people go through this scenario:

1. start with sync and 4000 threads

2. switch to HSHA, pre-7594

3. upgrade to a version after 7594, without changing this setting

4. experience awful performance due to insane thread contention