Field selector is not applied even when resource fields are matching

After upgrading from 4.9.2 to 5.9.0, I have observed that one of our unit tests (which is using KubernetesServer) is failing. It seems that object are not returned when using the Event API with field selectors. I did not yet checked other API’s neither whether it’s limited to the KubernetesServer.

Following a small reproduction unit test which illustrates the problem:

import io.fabric8.kubernetes.api.model.Event;
import io.fabric8.kubernetes.api.model.ObjectMeta;
import io.fabric8.kubernetes.client.KubernetesClient;
import io.fabric8.kubernetes.client.server.mock.KubernetesServer;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.junit.MockitoJUnitRunner;

import java.util.List;

import static org.assertj.core.api.AssertionsForClassTypes.assertThat;

@RunWith(MockitoJUnitRunner.class)
public class KubernetesClientTest {

    @Rule
    public KubernetesServer server = new KubernetesServer(true, true);

    @Test
    public void shouldReturnEventMatchingFieldSelector() {
        // given
        KubernetesClient kubernetesClient = server.getClient();
        Event kubernetesEvent = createKubernetesEventWithReason();
        kubernetesClient.v1().events().create(kubernetesEvent);

        // when
        List<Event> kubernetesEvents = kubernetesClient.v1().events().inAnyNamespace().withField("reason", "Rebooted").list().getItems();

        // then
        assertThat(kubernetesEvents.size()).isEqualTo(1);
    }

    private Event createKubernetesEventWithReason() {
        Event  event = new Event();
        ObjectMeta metaData = new ObjectMeta();
        metaData.setName("EventName");
        event.setMetadata(metaData);
        event.setReason("Rebooted");
        return event;
    }
}

Logs from the test execution:

Nov 08, 2021 9:37:39 AM okhttp3.mockwebserver.MockWebServer$2 execute
INFO: MockWebServer[58829] starting to accept connections
Nov 08, 2021 9:37:40 AM okhttp3.mockwebserver.MockWebServer$3 processOneRequest
INFO: MockWebServer[58829] received request: POST /api/v1/namespaces/test/events HTTP/1.1 and responded: HTTP/1.1 200 OK
Nov 08, 2021 9:37:40 AM okhttp3.mockwebserver.MockWebServer$3 processOneRequest
INFO: MockWebServer[58829] received request: GET /api/v1/events?fieldSelector=reason%3DRebooted HTTP/1.1 and responded: HTTP/1.1 200 OK
Nov 08, 2021 9:37:40 AM okhttp3.mockwebserver.MockWebServer$2 acceptConnections
INFO: MockWebServer[58829] done accepting connections: Socket closed

org.opentest4j.AssertionFailedError: 
Expecting:
 <[]>
to be equal to:
 <1>
but was not.
Expected :1
Actual   :[]

Please let me know if further information are required.

[manusa]

Could you please quickly check if this is still reproducible in #3562 🙏 ?

Maybe we can tackle the issue in scope of that PR.

[stale[bot]]

This issue has been automatically marked as stale because it has not had any activity since 90 days. It will be closed if no further activity occurs within 7 days. Thank you for your contributions!