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https://issues.apache.org/jira/browse/SPARK-31666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17104947#comment-17104947
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Stephen Hopper commented on SPARK-31666:
----------------------------------------
I was able to fix the issue by patching Spark. As noted in this issue:
[https://github.com/GoogleCloudPlatform/spark-on-k8s-operator/issues/828]
I applied versions of these two PRs (for Spark 3.0) (with some minor tweaks to
make them compatible with 2.4.5):
[https://github.com/apache/spark/pull/22323]
[https://github.com/apache/spark/pull/24879]
I then rebuilt Spark (as well as spark-submit and spark-operator) and it's
working now.
However, this is still going to be an issue for anyone on 2.4.5 as the docs
state that hostPath directories should be useable. Should I open a PR to
backport this fix for Spark 2.4.6? When is Spark 3.0 coming out?
> 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
> Priority: Major
>
> 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:
> {code:java}
> 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={}).{code}
>
> 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):
> {code:java}
> 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{code}
> Any ideas on what's causing this?
>
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