darenwkt commented on PR #409:
URL:
https://github.com/apache/flink-kubernetes-operator/pull/409#issuecomment-1291703643
Hi @morhidi,
I have updated the stackTrace to be a string and added a ConfigOption to
limit the length of the stackTrace string.
Regarding the concern on deserializing the error status into a valid json
field, I have tested that deserialization back into the FlinkResourceException
class works. My testing was done as follows:
1. `kubectl get flinkdeployment basic-example -o yaml > test.yaml`
2. Tested deserializing the `test.yaml` back into FlinkResourceException
class using the following code:
```
@Test
public void testYamlDeserialization() throws IOException {
Yaml yaml = new Yaml();
InputStream inputStream = this.getClass()
.getClassLoader()
.getResourceAsStream("test.yaml");
Map<String, Object> obj = yaml.load(inputStream);
System.out.println("deserialized yaml: " + obj);
ObjectMapper mapper = new ObjectMapper();
FlinkResourceException ex = mapper.readValue((String) ((Map<String,
Object>) obj.get("status")).get("error"), FlinkResourceException.class);
System.out.println("deserialized json: " + ex);
}
```
3. Results of System.out.println are:
```
deserialized yaml: {apiVersion=flink.apache.org/v1beta1,
kind=FlinkDeployment,
metadata={annotations={kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"flink.apache.org/v1beta1","kind":"FlinkDeployment","metadata":{"annotations":{},"name":"basic-example","namespace":"default"},"spec":{"flinkConfiguration":{"taskmanager.numberOfTaskSlots":"2"},"flinkVersion":"v1_15","image":"flink:1.15","job":{"jarURI":"local:///opt/flink/examples/streaming/StateMachineExample.jar","parallelism":2,"upgradeMode":"stateless"},"jobManager":{"resource":{"cpu":1,"memory":"2048m"}},"podTemplate":{"apiVersion":"v1","kind":"Pod","metadata":{"name":"pod-template"},"spec":{"containers":[{"name":"flink-main-container","volumeMounts":[{"mountPath":"/opt/flink/log","name":"flink-logs"},{"mountPath":"/opt/flink/downloads","name":"downloads"}]}]}},"serviceAccount":"flink","taskManager":{"resource":{"cpu":1,"memory":"2048m"}}}}
```
```
deserialized json:
FlinkResourceException(type=org.apache.flink.kubernetes.operator.exception.ReconciliationException,
message=org.apache.flink.client.deployment.ClusterDeploymentException: Could
not create Kubernetes cluster "basic-example"., stackTraceElements=null,
additionalMetadata=null,
throwableList=[FlinkResourceException(type=org.apache.flink.client.deployment.ClusterDeploymentException,
message=Could not create Kubernetes cluster "basic-example".,
stackTraceElements=null, additionalMetadata=null, throwableList=null),
FlinkResourceException(type=org.apache.flink.kubernetes.shaded.io.fabric8.kubernetes.client.KubernetesClientException,
message=Failure executing: POST at:
https://10.96.0.1/apis/apps/v1/namespaces/default/deployments. Message:
Deployment.apps "basic-example" is invalid:
[spec.template.spec.containers[0].volumeMounts[0].name: Not found:
"flink-logs", spec.template.spec.containers[0].volumeMounts[1].name: Not found:
"downloads"]. Received status: Status(apiVer
sion=v1, code=422,
details=StatusDetails(causes=[StatusCause(field=spec.template.spec.containers[0].volumeMounts[0].name,
message=Not found: "flink-logs", reason=FieldValueNotFound,
additionalProperties={}),
StatusCause(field=spec.template.spec.containers[0].volumeMounts[1].name,
message=Not found: "downloads", reason=FieldValueNotFound,
additionalProperties={})], group=apps, kind=Deployment, name=basic-example,
retryAfterSeconds=null, uid=null, additionalProperties={}), kind=Status,
message=Deployment.apps "basic-example" is invalid:
[spec.template.spec.containers[0].volumeMounts[0].name: Not found:
"flink-logs", spec.template.spec.containers[0].volumeMounts[1].name: Not found:
"downloads"], metadata=ListMeta(_continue=null, remainingItemCount=null,
resourceVersion=null, selfLink=null, additionalProperties={}), reason=Invalid,
status=Failure, additionalProperties={})., stackTraceElements=null,
additionalMetadata=null, throwableList=null)])
```
As a result, I can confirm deserialization of the json works. The question
now is whether we are ok with the current format the error field is shown in CR
yaml, which includes the escape field. I tried to search this up and the cause
of this is we are storing the string with single quote '' instead of double
quote "" in the yaml. Referring to
https://www.baeldung.com/yaml-multi-line#quoting. I have tried to looking at
openAPIV3Schema, but I don't see a straightforward way to change it to a double
quote. I also suspect this could be related to how K8 api serializes the CR
into yaml.
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