Issue

The Jenkins logs regularly show the following stacktrace:

2020-11-04 06:49:56.143+0000 [id=329776]    WARNING i.f.k.c.d.i.WatchConnectionManager$1#onFailure: Exec Failure
java.util.concurrent.RejectedExecutionException: Task okhttp3.RealCall$AsyncCall@556ba43e rejected from java.util.concurrent.ThreadPoolExecutor@217680e3[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 30]
    at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2063)
    at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:830)
    at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1379)
    at okhttp3.RealCall$AsyncCall.executeOn(RealCall.java:183)
Caused: java.io.InterruptedIOException: executor rejected
    at okhttp3.RealCall$AsyncCall.executeOn(RealCall.java:186)
    at okhttp3.Dispatcher.promoteAndExecute(Dispatcher.java:186)
    at okhttp3.Dispatcher.enqueue(Dispatcher.java:137)
    at okhttp3.RealCall.enqueue(RealCall.java:127)
    at okhttp3.internal.ws.RealWebSocket.connect(RealWebSocket.java:193)
    at okhttp3.OkHttpClient.newWebSocket(OkHttpClient.java:435)
    at io.fabric8.kubernetes.client.dsl.internal.WatchConnectionManager.runWatch(WatchConnectionManager.java:156)

Environment

• CloudBees CI (CloudBees Core) on modern cloud platforms - Managed Master
• CloudBees CI (CloudBees Core) on traditional platforms - Client Master
• CloudBees Jenkins Platform - Client Master
• CloudBees Jenkins Distribution
• Jenkins LTS
• Kubernetes plugin < 1.28.1

Resolution

This exception is due to the Kubernetes plugin trying to cleanup old Kubernetes clients using an expired authentication token.
Version 1.28.1 of the Kubernetes plugin contains a fix that simplifies the Kubernetes client management and should avoid this stack.

Workaround

This exception should only be cosmetic with no impact.

References