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Known issues

This section lists known issues that you might run into while using the Data Hub service.

CB-11925: Knox Load Balancer API requests initiated from Knox Gateway hosts can fail with Connection timeout error

Problem: When logged into a Data Lake or Data Hub node that has a Knox Gateway service instance configured on it, making Knox API calls through the Knox load balancer can result in a connection timeout error. This is because for security reasons, the IP address of the request is preserved in the traffic passed through the load balancer. Preserving the IP address means that the load balancer will reject "loopback" traffic, meaning traffic that originates and is directed back to the same node.

Workaround: If Knox API calls need to be made while logged into a Knox gateway node, use the hostname of the node instead of the load balancer hostname in the API call.

The Knox load balancer hostname can be identified by the "-gateway" suffix in the first clause of the hostname with no numeric identifier. For example: <cluster-name>-gateway.<env-shortname>.<hash>.cloudera.site is the load balancer hostname, and <cluster-name>-gateway0.<env-shortname>.<hash>.cloudera.site is a direct node hostname.

CB-23926: Autoscaling must be stopped before performing FreeIPA upgrade

Problem: During autoscaling, compute nodes are stopped and cannot receive the latest FreeIPA IP address update in a stopped state. This causes the Data Hub clusters to become unhealthy after the FreeIPA upgrade when autoscaling is enabled.

Workaround:
  1. Disable autoscaling before perfoming FreeIPA upgrade.
  2. Start all compute nodes, which are in a STOPPED state.
  3. Perform the FreeIPA upgrade.
  4. Enable autoscaling after FreeIPA upgrade is successful.

CB-23940: Ranger YARN repository is not cleaned up after deleting stopped cluster

Problem: When a stopped Data Hub cluster is deleted, the Ranger YARN repository that belongs to the deleted Data Hub cluster is not cleaned up. This causes errors when creating a cluster with the same cluster name.

Workaround: Start the Data Hub cluster before deleting. If the cluster was deleted in stopped state, delete the YARN repository using the Ranger Admin UI.

Technical Service Bulletins

TSB 2022-568: HBase normalizer must be disabled for Salted Phoenix tables
When Apache Phoenix (“Phoenix”) creates a salted table, it pre-splits the table according to the number of salt regions. These regions must always be kept separate, otherwise Phoenix does not work correctly.

The HBase normalizer is not aware of this requirement, and in some cases the pre-split regions are merged automatically. This causes failure in Phoenix.

The same requirement applies when merging regions of salted tables manually: regions containing different salt keys (the first byte of the rowkey) must never be merged.

Note that either automatic or manual splitting of the regions for a salted table does not cause a problem. The problem only occurs when adjacent regions containing different salt keys are merged.

Upstream JIRA
PHOENIX-4906
Knowledge article
For the latest update on this issue, see the corresponding Knowledge article: TSB 2022-568: Hbase normalizer must be disabled for Salted Phoenix tables