Known Issues in Impala Virtual Warehouses on public clouds

Learn about the known issues related to Impala Virtual Warehouse in Cloudera Data Warehouse service on public clouds, the impact or changes to the functionality, and the workaround.

DWX-6674: Hue connection fails on cloned Impala Virtual Warehouses after upgrading
Problem: If you clone an Impala Virtual Warehouse from a recently upgraded Impala Virtual Warehouse, and then try to connect to Hue, the connection fails.
Workaround: Create a new Impala Virtual Warehouse and do not clone from a recently upgraded warehouse. Then the connection to Hue from the new Impala Virtual Warehouse succeeds.
DWX-5841: Virtual Warehouse endpoints are now restricted to TLS 1.2
Problem: TLS 1.0 and 1.1 are no longer considered secure, so now Virtual Warehouse endpoints must be secured with TLS 1.2 or later, and then the environment that the Virtual Warehouse uses must be reactivated in CDW. This includes both Hive and Impala Virtual Warehouses. To reactivate the environment in the CDW UI:
  1. Deactivate the environment. See Deactivating AWS environments or Deactivating Azure environments.
  2. Activate the environment. See Activating AWS environments or Activating Azure environments
Workaround: If environment reactivation is not possible, you can perform manual steps using the kubectl command line tool to pick up the TLS 1.2 endpoint change. Open a terminal window on a system where the kubectl command line tool is installed, log in, and run the following commands:
kubectl edit svc nginx-service -n <cluster-name>

# Add the following under the metadata.annotations field
service.beta.kubernetes.io/aws-load-balancer-ssl-negotiation-policy: "ELBSecurityPolicy-TLS-1-2-2017-01"
      
# Save and quit the editor, and then run the following command to check your changes.
      
kubectl get svc nginx-service -n <cluster-name> -o yaml
      
# Make sure that the annotation you added is present.
DWX-5276: Upgrading an older version of an Impala Virtual Warehouse can result in error state
Problem: If you upgrade an older version of an Impala Virtual Warehouse (DWX 1.1.1.1-4) to the latest version, the Virtual Warehouse can get into an Updating or Error state.
Workaround: none
DWX-3914: Collect Diagnostic Bundle option does not work on older environments
The Collect Diagnostic Bundle menu option in Impala Virtual Warehouses does not work for older environments:


Data caching:
This feature is limited to 200 GB per compute node, multiplied by the total number of compute nodes.
Sessions with Impala continue to run for 15 minutes after the connection is disconnected.
When a connection to Impala is disconnected, the session continues to run for 15 minutes in case so the user or client can reconnect to the same session again by presenting the session_token. After 15 minutes, the client must re-authenticate to Impala to establish a new connection.