[CASSANDRA-6188] The JMX stats for Speculative Retry stops moving during a node failure outage period

• Type: Bug
• Status: Open
• Priority: Low
• Resolution: Unresolved
• Fix Version/s: 3.11.x
• Component/s: Legacy/Observability

Environment

One data center of 4 Cassandra-2.0 nodes with default configuration parameters deployed on 4 separate machines. A testing app (with either Astyanax or DataStax client driver) interacts with the Cassandra data center. A traffic generator is sending traffic to the testing app for testing purpose.

• Severity: Low
• Since Version: 2.0 rc2
• Assignee: Ryan McGuire
• Reporter: Li Zou

Authors

Ryan McGuire

• Created: 11/Oct/13 22:26
• Updated: 16/Apr/19 09:32

Description

Under normal testing traffic level with default Cassandra Speculative Retry configuration for each table (i.e. 99 percentile), JConsole shows that the JMX stats for Speculative Retry increments slowly. However, during the node failure outage period (i.e. immediately after the node was killed and before the gossip figures out that the node is down), JConsole shows that the JMX stats for Speculative Retry stops moving. That is, for around 20 seconds, the JMX stats for Speculative Retry does not move.

This is true for all other Speculative Retry options.