[jira] [Created] (SPARK-31666) Cannot map hostPath volumes to container

["Stephen Hopper (Jira)" <ji...@apache.org>]

Stephen Hopper created SPARK-31666:
--------------------------------------

             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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