Blocked/waiting UCP Threads In UCP 11.2.0.4 (Doc ID 1935869.1)

Last updated on MARCH 08, 2017

Applies to:

JDBC - Version 11.2.0.4.0 to 11.2.0.4.0 [Release 11.2]
Universal Connection Pool - Version 11.2.0.1.0 to 11.2.0.1.0 [Release 11.2]
Information in this document applies to any platform.

Symptoms

Application is unable to use the UCP threadpool after a recent upgrade to JDBC 11.2.0.4 and UCP 11.2.0.4. Database version is 11.1.0.7.
Thread pool is at maximum capacity (24 in this case) due to waiting tasks, and UCP results in not allowing any further connections.

The issue occurs when Fast Connection Failover (FCF) is enabled.

 

Cause

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