Stephen Hopper created SPARK-31666:
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Summary: Cannot map hostPath volumes to container
Key: SPARK-31666
URL: https://issues.apache.org/jira/browse/SPARK-31666
Project: Spark
Issue Type: Bug
Components: Kubernetes
Affects Versions: 2.4.5
Reporter: Stephen Hopper
I'm trying to mount additional hostPath directories as seen in a couple of
places:
[https://aws.amazon.com/blogs/containers/optimizing-spark-performance-on-kubernetes/]
[https://github.com/GoogleCloudPlatform/spark-on-k8s-operator/blob/master/docs/user-guide.md#using-volume-for-scratch-space]
[https://spark.apache.org/docs/latest/running-on-kubernetes.html#using-kubernetes-volumes]
However, whenever I try to submit my job, I run into this error:
```
Uncaught exception in thread kubernetes-executor-snapshots-subscribers-1 │
io.fabric8.kubernetes.client.KubernetesClientException: Failure executing: POST
at: https://kubernetes.default.svc/api/v1/namespaces/my-spark-ns/pods. Message:
Pod "spark-pi-1588970477877-exec-1" is invalid:
spec.containers[0].volumeMounts[1].mountPath: Invalid value: "/tmp1": must be
unique. Received status: Status(apiVersion=v1, code=422,
details=StatusDetails(causes=[StatusCause(field=spec.containers[0].volumeMounts[1].mountPath,
message=Invalid value: "/tmp1": must be unique, reason=FieldValueInvalid,
additionalProperties={})], group=null, kind=Pod,
name=spark-pi-1588970477877-exec-1, retryAfterSeconds=null, uid=null,
additionalProperties={}), kind=Status, message=Pod
"spark-pi-1588970477877-exec-1" is invalid:
spec.containers[0].volumeMounts[1].mountPath: Invalid value: "/tmp1": must be
unique, metadata=ListMeta(_continue=null, remainingItemCount=null,
resourceVersion=null, selfLink=null, additionalProperties={}), reason=Invalid,
status=Failure, additionalProperties={}).
```
This is my spark-submit command (note: I've used my own build of spark for
kubernetes as well as a few other images that I've seen floating around (such
as this one `seedjeffwan/spark:v2.4.5`) and they all have this same issue):
```
bin/spark-submit \
--master k8s://https://my-k8s-server:443 \
--deploy-mode cluster \
--name spark-pi \
--class org.apache.spark.examples.SparkPi \
--conf spark.executor.instances=2 \
--conf spark.kubernetes.container.image=my-spark-image:my-tag \
--conf spark.kubernetes.driver.pod.name=sparkpi-test-driver \
--conf spark.kubernetes.namespace=my-spark-ns \
--conf
spark.kubernetes.executor.volumes.hostPath.spark-local-dir-2.mount.path=/tmp1 \
--conf
spark.kubernetes.executor.volumes.hostPath.spark-local-dir-2.options.path=/tmp1
\
--conf spark.local.dir="/tmp1" \
--conf spark.kubernetes.authenticate.driver.serviceAccountName=spark
local:///opt/spark/examples/jars/spark-examples_2.11-2.4.5.jar 20000
```
Any ideas on what's causing this?
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