[SPARK-28905] PVs mounted into Spark may not be writable by Spark

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 3.1.0
• Component/s: Kubernetes, Spark Core
• Assignee: Holden Karau
• Reporter: Holden Karau
• Created: 28/Aug/19 22:02
• Updated: 17/May/20 18:25

Description

Right now, for Spark to have write access to the PVs we provide it, they need to be created with UID 185. This may be a feature, but if we wanted to make this more flexible we could set a FsGroup in our security context when setting up the volumes. This would give Spark access provided the PV supports fsgroup (which on minikube does not appear to be the case - https://github.com/kubernetes/minikube/issues/1990 )

 

If we did want to do this we could add the securitygroup in MountVolumesFeatureStep but I don't know if we want to do this or if the current behaviour is desired.

I ran into this while getting the integration tests to work w/minikube 1.3.1 on OSX. See https://issues.apache.org/jira/browse/SPARK-28904 for details.

 

cc ifilonenko for thoughts