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What I mean is you could create a K8s deployment using the Flink image just like following. After then, you could use "kubectl exec -it {pod_name} bash" to tunnel in and submit the Flink python application to the existing session cluster.
apiVersion: apps/v1
kind: Deployment
metadata:
name: flink-client
spec:
replicas: 1
selector:
matchLabels:
app: flink-client
template:
metadata:
labels:
app: flink-client
spec:
containers:
- name: client
image: flink:1.12.2
imagePullPolicy: Always
args: ["sleep", "86400"]
Best, Yang
Yang,
"... This could be done by starting a pod as the Flink client."
Do you have an example yaml you could share?
I think you want to submit a Flink python job to the existing session cluster. Please ensure the session cluster is created with proper service exposed type[1]. * LoadBalancer for the cloud environment * NodePort for self managed K8s cluster * ClusterIP for the K8s internal submission, which means you should submit the Flink application in the K8s cluster. This could be done by starting a pod as the Flink client.
Best, Yang
Trying to spin up a Python Flink instance in my Kubernetes cluster with this configuration ...
sudo ./bin/flink run \
--target kubernetes-session \
-Dkubernetes.cluster-id=flink-python \
-Dkubernetes.namespace=cmdaa \
-Dkubernetes.container.image=cmdaa/pyflink:0.0.1 \
--pyModule word_count \
--pyFiles /opt/flink-1.12.2/examples/python/table/batch/word_count.py
... But getting this error:
Traceback (most recent call last):
File "/Users/admin/.pyenv/versions/3.6.10/lib/python3.6/runpy.py", line 193, in _run_module_as_main
"__main__", mod_spec)
File "/Users/admin/.pyenv/versions/3.6.10/lib/python3.6/runpy.py", line 85, in _run_code
exec(code, run_globals)
File "/var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/T/pyflink/074c581c-5b39-4b07-ac84-55a86c46f9eb/affe3559-5364-43f1-93ef-b7f6cd9a2f77/word_count.py", line 80, in <module>
word_count()
File "/var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/T/pyflink/074c581c-5b39-4b07-ac84-55a86c46f9eb/affe3559-5364-43f1-93ef-b7f6cd9a2f77/word_count.py", line 74, in word_count
t_env.execute("word_count")
File "/opt/flink-1.12.2/opt/python/pyflink.zip/pyflink/table/table_environment.py", line 1276, in execute
File "/opt/flink-1.12.2/opt/python/py4j-0.10.8.1-src.zip/py4j/java_gateway.py", line 1286, in __call__
File "/opt/flink-1.12.2/opt/python/pyflink.zip/pyflink/util/exceptions.py", line 147, in deco
File "/opt/flink-1.12.2/opt/python/py4j-0.10.8.1-src.zip/py4j/protocol.py", line 328, in get_return_value
py4j.protocol.Py4JJavaError: An error occurred while calling o2.execute.
: java.lang.RuntimeException: org.apache.flink.client.deployment.ClusterRetrieveException: Could not get the rest endpoint of flink-python
at org.apache.flink.kubernetes.KubernetesClusterDescriptor.lambda$createClusterClientProvider$0(KubernetesClusterDescriptor.java:102)
at org.apache.flink.kubernetes.KubernetesClusterDescriptor.retrieve(KubernetesClusterDescriptor.java:145)
at org.apache.flink.kubernetes.KubernetesClusterDescriptor.retrieve(KubernetesClusterDescriptor.java:66)
at org.apache.flink.client.deployment.executors.AbstractSessionClusterExecutor.execute(AbstractSessionClusterExecutor.java:75)
at org.apache.flink.table.api.internal.BatchTableEnvImpl.executePipeline(BatchTableEnvImpl.scala:347)
at org.apache.flink.table.api.internal.BatchTableEnvImpl.execute(BatchTableEnvImpl.scala:317)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.flink.api.python.shaded.py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
at org.apache.flink.api.python.shaded.py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
at org.apache.flink.api.python.shaded.py4j.Gateway.invoke(Gateway.java:282)
at org.apache.flink.api.python.shaded.py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
at org.apache.flink.api.python.shaded.py4j.commands.CallCommand.execute(CallCommand.java:79)
at org.apache.flink.api.python.shaded.py4j.GatewayConnection.run(GatewayConnection.java:238)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.flink.client.deployment.ClusterRetrieveException: Could not get the rest endpoint of flink-python
... 17 more
org.apache.flink.client.program.ProgramAbortException
at org.apache.flink.client.python.PythonDriver.main(PythonDriver.java:124)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:349)
at org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:219)
at org.apache.flink.client.ClientUtils.executeProgram(ClientUtils.java:114)
at org.apache.flink.client.cli.CliFrontend.executeProgram(CliFrontend.java:812)
at org.apache.flink.client.cli.CliFrontend.run(CliFrontend.java:246)
at org.apache.flink.client.cli.CliFrontend.parseAndRun(CliFrontend.java:1054)
at org.apache.flink.client.cli.CliFrontend.lambda$main$10(CliFrontend.java:1132)
at org.apache.flink.runtime.security.contexts.NoOpSecurityContext.runSecured(NoOpSecurityContext.java:28)
at org.apache.flink.client.cli.CliFrontend.main(CliFrontend.java:1132)
-- Robert Cullen
240-475-4490
--
Robert Cullen
240-475-4490
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Locked
