OCPBUGS-75009: skip dynamically adding map entries

[jcmoraisjr]

DCM updates frontend by adding new map entries. The new entries are however being added in the end of the map list, which can lead to requests being handled incorrectly in case of two distinct routes overlap their URLs.

A proper fix is refactoring the maps entity, making it to sort map entries and replace all the map content. For now, we are skipping the DCM workflow if an add map operation is detected, moving to fork+reload instead.

Jira: https://issues.redhat.com/browse/OCPBUGS-75009

[openshift-ci-robot]

@jcmoraisjr: This pull request references Jira Issue OCPBUGS-75009, which is valid. The bug has been moved to the POST state.

3 validation(s) were run on this bug

• bug is open, matching expected state (open)
• bug target version (4.22.0) matches configured target version for branch (4.22.0)
• bug is in the state New, which is one of the valid states (NEW, ASSIGNED, POST)

The bug has been updated to refer to the pull request using the external bug tracker.

Details

In response to this:

DCM updates frontend by adding new map entries. The new entries are however being added in the end of the map list, which can lead to requests being handled incorrectly in case of two distinct routes overlap their URLs.

A proper fix is refactoring the maps entity, making it to sort map entries and replace all the map content. For now, we are skipping the DCM workflow if an add map operation is detected, moving to fork+reload instead.

Jira: https://issues.redhat.com/browse/OCPBUGS-75009

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[openshift-ci]

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[lihongan]

/retest

[ShudiLi]

Tested it with 4.22.0-0-2026-02-04-071816-test-ci-ln-h9p6wnk-latest

1. Created the cluster by bot
launch 4.22,openshift/router#726,openshift/api#2621 gcp

2.
% oc get clusterversion
NAME      VERSION                                                AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.22.0-0-2026-02-04-071816-test-ci-ln-h9p6wnk-latest   True        False         76m     Cluster version is 4.22.0-0-2026-02-04-071816-test-ci-ln-h9p6wnk-latest

3. Enable DCM
% oc get featuregates cluster -oyaml | yq ".status.featureGates[0].enabled" | grep IngressControllerDynamicConfigurationManager
- name: IngressControllerDynamicConfigurationManager
% oc -n openshift-ingress get deployment router-default -oyaml | grep -i -A1 -E "ROUTER_MAX_DYNAMIC_SERVERS|ROUTER_BLUEPRINT_ROUTE_POOL_SIZE"
        - name: ROUTER_BLUEPRINT_ROUTE_POOL_SIZE
          value: "0"
--
        - name: ROUTER_MAX_DYNAMIC_SERVERS
          value: "1"
% 

4.  Patched the default ingresscontroller with  InterNamespaceAllowed namespaceOwnership 

5. Created two namespaces, created pod, service and route with same hostnames but with different paths under each namespace 
% oc -n test get route
NAME          HOST/PORT                                                       PATH    SERVICES      PORT          TERMINATION   WILDCARD
unsec-apach   unsec-service.apps.ci-ln-h9p6wnk-72292.gcp-2.ci.openshift.org   /path   unsec-apach   unsec-apach                 None
% oc -n test2 get route
NAME           HOST/PORT                                                       PATH        SERVICES       PORT           TERMINATION   WILDCARD
unsec-apach2   unsec-service.apps.ci-ln-h9p6wnk-72292.gcp-2.ci.openshift.org   /path/bar   unsec-apach2   unsec-apach2                 None

6. Curl the two routes
% curl http://unsec-service.apps.ci-ln-h9p6wnk-72292.gcp-2.ci.openshift.org/path/index.html
path test
% curl http://unsec-service.apps.ci-ln-h9p6wnk-72292.gcp-2.ci.openshift.org/path/bar/index.html
path/bar test
%

[alebedev87]

/assign @bentito

[jcmoraisjr]

/retest

[openshift-ci]

@jcmoraisjr: all tests passed!

Full PR test history. Your PR dashboard.

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