February 7, 2023

Technical Service Bulletins

TSB-732 2024: Incorrect results are generated by Hive JOIN when bloom filter is activated

The bloom filter implemented in HIVE-23880 was designed to enhance performance for queries with JOIN statements, where one small table and another significantly larger table is joined on partition keys. However, the bloom filter introduced an issue in Apache Hive (Hive), when dynamic semijoin redaction is involved that generates incorrect query results. This issue is corrected in HIVE-26655.

Upstream JIRA

Hive-23880(cause)HIVE-26655(fix)

Knowledge article

For the latest update on this issue see the corresponding Knowledge article: TSB 2024-732: Incorrect results are generated by Hive JOIN when bloom filter is activated

New known Issues in this release

Do not upgrade this release to EKS 1.22

The latest version of Cloudera Data Warehouse (CDW) 1.6.1-b258 (released February 7, 2023) provisions AWS Elastic Kubernetes Service (EKS) 1.22 by default in AWS environments; however, upgrading your activated environments to EKS 1.22 or later is not supported. Do not upgrade your EKS clusters to 1.22.

DWX-14163 Limitations reading Iceberg tables in Avro file format from Impala

The Avro, Impala, and Iceberg specifications describe some limitations related to Avro, and those limitations exist in CDP. In addition to these, the DECIMAL type is not supported in this release.

DWX-14286 Loading data to Iceberg error

Using LOAD DATA INPATH from an Impala Virtual Warehouse to load data to an Iceberg table on S3/ADLS when hidden files (files that are prefixed with . or _) are in the path can lead to unexpected query failures. For example:

AnalysisException: INPATH contains unsupported LOAD format, file '
s3a://dwx-testdata/impala/sql_test/tests/load_data_inpath/runtime_data/0690a6fa9bfb11ed920c164053429bec/load_data_test/A/impala_data/impala_alltypessmall_data/alltypessmall_parquet_iceberg/year=2009/month=1/.hiddenfileforloaddatatest
' has 'This' magic string.

Hive can crash due to the default setting of a caching property

Background: The relatively new hive.fetch.task.caching property was designed to prevent files from being cleaned up prematurely during the fetch phase. By default, hive.fetch.task.caching is enabled for queries that have been converted by the hive.fetch.task.conversion optimization.

Problem: The resulting caching activity can use too much heap while running queries that execute fetch tasks with a cache size of 1GB. Frequent garbage collection and high CPU usage can occur, causing Hue and other clients to timeout when returning results.

Workaround: Try setting hive.fetch.task.caching to false to disable the optimization. This action might cause queries to fail due to timing if the table is modified concurrent with the fetching. If problems continue, or cannot tolerate the low risk of a query failure, set hive.fetch.task.conversion to none. In this release, hive.fetch.task.conversion=none might add a little latency to some SELECT queries.

DWX-14409 Starting a Virtual Warehouse in an AWS environments in the Asia-Pacific Southeast region fails

When you upgrade the Virtual Warehouse in this release and start it, a timing issue causes failure.

Workaround: Continue using the previous release 1.5.1-b110 (released Nov 22, 2022). Do not upgrade to 1.6.1-b282 (released Feb 7, 2023). Delay upgrading your Virtual Warehouse until the next release of CDW.

DWX-14376 Upgrade Database Catalog button issue

A UI issue exists when you to upgrade the latest Virtual Warehouse 1.6.1-b258 (released Feb 7, 2023) and you are already running the latest release. The Upgrade Database Catalog button is not working when you attempt this futile Virtual Warehouse upgrade.

Carried over from the previous release: General

DWX-13103 Cloudera Data Warehouse environment activation problem

When CDW environments are activated, a race condition can occur between the prometheus pod and istiod pod. The prometheus pod can be set up without an istio-proxy container, causing communication failures to/from prometheus to any other pods in the Kubernetes cluster. Data Warehouse prometheus-related functionalities, such as autoscaling, stop working. Grafana dashboards, which get metrics from prometheus, are not populated.

Workaround: Restart the prometheus pod so that it gets the istio-proxy container.

DWX-6619 Browser auto-close not working on some browsers after token-Based authentication for accessing CDW

The Firefox and Edge browser window does not close automatically after successful authentication.

DWX-9774 Database Catalog or Virtual Warehouse image version problem

Background: In Cloudera Data Warehouse 2021.0.3-b27 - 2021.0.5-b36, you can choose any supported image version when you create a Database Catalog or Virtual Warehouse, assuming you have the CDW_VERSIONED_DEPLOY entitlement.

Problem: In Cloudera Data Warehouse 2021.0.6-b96, you can choose an image version other than 2021.0.6-b96 when you create a Database Catalog or Virtual Warehouse only if you use an existing environment. An existing environment is one you created in 2021.0.3-b27 - 2021.0.5-b36.

Workaround: In 2021.0.6-b96, use an environment you created before this release to choose an image version other than 2021.0.6-b96 when you create a Database Catalog or Virtual Warehouse.

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-5742: Upgrading multiple Hive and Impala Virtual Warehouses or Database Catalogs at the same time fails

Problem: Upgrading multiple Hive and Impala Virtual Warehouses or Database Catalogs at the same time fails.

Workaround: If you need to upgrade or create multiple Hive and Impala Virtual Warehouses or Database Catalogs, perform the upgrade or creation sequentially one at a time.

Carried over from the previous release: AWS

Workloads from CDW versions 1.4.2 and earlier cannot be deployed on new AWS environments

You must upgrade the version of Kubernetes that supports your existing CDW clusters to EKS version 1.21. AWS environments you activate using this release of Cloudera Data Warehouse, and later, will use version 1.22.

Because new environments are provisioned automatically to use AWS Elastic Kubernetes Service (EKS) 1.22, deprecated APIs used in workloads of versions 1.4.2-b118 (released August 4, 2022) and earlier are not supported in this version 1.5.1-b110 (released November 22, 2022). This issue affects you only if you have the CDW_VERSIONED_DEPLOY entitlement.

Workaround: Create new workloads or use workloads from the previous release CDW 1.4.3--b225 (released September 15, 2022). Workloads from CDW 1.4.2-b118 (released August 4, 2022) and earlier in Database Catalogs, Hive, Impala, Hue, Data Visualization, and are incompatible with EKS 1.22.

AWS availability zone inventory issue

In this release, you can select a preferred availability zone when you create a Virtual Warehouse; however, AWS might not be able to provide enough compute instances of the type that Cloudera Data Warehouse needs.

Workaround: If you experience this AWS issue, try recreating the Virtual Warehouse and choosing a different availability zone.

DWX-7613: CloudFormation stack creation using AWS CLI broken for CDW Reduced Permissions Mode

Problem: If you use the AWS CLI to create a CloudFormation stack to activate an AWS environment for use in Reduced Permissions Mode, it fails and returns the following error:

An error occurred (ValidationError) when calling the CreateStack
       operation: Parameters: [SdxDDBTableName] must have values

The default value of SdxDDBTableName is not being set. If you create the CloudFormation stack using the AWS Console, there is no problem.

Workaround: If you must use the AWS CLI, edit the CloudFormation stack template file as follows:

SdxDDBTableName:
       Description: DynamoDB table name for the SDX S3 file listings, created through S3Guard
       Type: String
       Default: " "

Then rerun the CloudFormation stack creation command using the AWS CLI.

ENGESC-8271: Helm 2 to Helm 3 migration fails on AWS environments where the overlay network feature is in use and namespaces are stuck in a terminating state

Problem: While using the overlay network feature for AWS environments and after attempting to migrate an AWS environment from Helm 2 to Helm 3, the migration process fails.

Workaround: Run the following kubectl command to determine whether you have any namespaces stuck in a terminating state:

kubectl get ns

Then contact Cloudera Technical Support to report and get help on this issue.

DWX-6970: Tags do not get applied in existing CDW environments

Problem: You may see the following error while trying to apply tags to Virtual Warehouses in an existing CDW environment: An error occurred (UnauthorizedOperation) when calling the CreateTags operation: You are not authorized to perform this operation and Compute node tagging was unsuccessful. This happens because the ec2:CreateTags privilege is missing from your AWS cluster-autoscaler inline policy for the NodeInstanceRole role.

Workaround: Add the ec2:CreateTags privilege to the cluster-autoscaler inline policy as follows:

1. Log into the AWS IAM console at https://console.aws.amazon.com/iam/.
2. In the navigation panel, choose Roles.
3. Search the list of roles for NodeInstanceRole.
4. Click Permissions.
5. Select cluster-autoscaler and click Edit policy.
6. Add the ec2:CreateTags line in the Actions section after the ec2:DescribeLaunchTemplateVersions line as shown:

   "Version": "2012-10-17",
             "Statement": [
             {
             "Action": [
             "autoscaling:DescribeAutoScalingGroups",
             "autoscaling:DescribeAutoScalingInstances",
             "autoscaling:DescribeTags",
             "autoscaling:DescribeLaunchConfigurations",
             "autoscaling:SetDesiredCapacity",
             "autoscaling:TerminateInstanceInAutoScalingGroup",
             "ec2:DescribeLaunchTemplateVersions",
             "ec2:CreateTags"
             ],

7. Save changes.

Carried over from the previous release: Azure

Workloads from earlier CDW versions cannot be deployed on new Azure environments

Because new environments are provisioned automatically to use Azure Kubernetes Service (AKS) 1.22, deprecated APIs used in workloads of earlier versions are not supported in this version 2022.0.9.0-120 (released August 4, 2022). This issue affects you only if you have the CDW_VERSIONED_DEPLOY entitlement.

Workaround: Create new workloads. Workloads in Database Catalogs, Hive, Impala, Hue, Data Visualization, and are incompatible with AKS 1.22.

Incorrect diagnostic bundle location

Problem:The path you see to the diagnostic bundle is wrong when you create a Virtual Warehouse, collect a diagnostic bundle of log files for troubleshooting, and click Edit > Diagnostic Bundle. Your storage account name is missing from the beginning of the path.

Workaround:To find your diagnostic bundle, add your storage account name to the beginning of the path, for example:

my-storage-account-name/log-files/clusters/my-env/my-warehouse-xx-yy/warehouse/debug-artifacts/hive/compute-zz-mvvf/compute-zz-mvvf-0926210111-0927090111-01234.zip

To get your storage account name, in Cloudera Management Console, click Environments, select your environment, and scroll down to Logs Storage and Audits. The first part of the path is your storage account name.

Changed environment credentials not propagated to AKS

Problem: When you change the credentials of a running cloud environment using the Management Console, the changes are not automatically propagated to the corresponding active Cloudera Data Warehouse (CDW) environment. As a result, the Azure Kubernetes Service (AKS) uses old credentials and may not function as expected resulting in inaccessible Hive or Impala Virtual Warehouses.

Workaround: To resolve this issue, you must manually synchronize the changes with the CDW AKS resources. To synchronize the updated credentials, see Update AKS cluster with new service principal credentials in the Azure product documentation.

Carried over from the previous release: Database Catalog

Non-default Database Catalogs created with several earlier CDW versions fails

This issue affects you only if you meet the following conditions:

• You have a versioned CDW deployment and the multi default DBC entitlement.
• You are using this release of CDW version 2022.0.9.0-120 (released August 4, 2022).
• You added Database Catalogs (not the automatically generated default Database Catalog) using either one of these CDW versions:
  • 2022.0.8.0-89 (released June, 22, 2022)
  • 2022-0.7.1-2 (released May 10, 2022)

Do not attempt to upgrade the Database Catalog you created with these earlier releases. The Database Catalog will fail. Your existing Database Catalog created with the earlier release works fine with CDW Runtime. Recreating your existing Database Catalog updates CDW Runtime for 2022.0.9.0-120 (released August 4, 2022).

DWX-7349: In reduced permissions mode, default Database Catalog name does not include the environment name

Problem:

When you activate an AWS environment in reduced permissions mode, the default Database Catalog name does not include the environment name:

This does not cause collisions because each Database Catalog named "default" is associated with a different environment. For more information about reduced permissions mode, see Reduced permissions mode for AWS environments.

Workaround: None available.

DWX-6167: Maximum connections reached when creating multiple Database Catalogs

Problem:After creating 17 Database Catalogs on one AWS environment, Virtual Warehouses failed to start.

Workaround: Limit the number of Database Catalogs created on one environment to 5. This applies to both AWS and Azure environments.

Carried over from the previous release: Hive Virtual Warehouse

Diagnostic bundle download fails

After upgrading to version 1.4.3 (released September 15, 2022), downloading the diagnostic bundle for the Hive Virtual Warehouse results in an error. New environments do not have this problem. The problem is caused by missing permissions to access Kubernetes resources. Version 1.4.3 adds a requirement for the role-based access control (rbac) permissions to download the diagnostic bundle.

Workaround: Add the missing rbac permissions as follows:

1) Create the following file:

apiVersion: rbac.authorization.k8s.io/v1
       kind: ClusterRole
       metadata:
       name: diagnostic-data-generator-role-monitor
       rules:
       - apiGroups:
       - ""
       resources:
       - configmaps
       - events
       - pods
       - persistentvolumeclaims
       - nodes
       verbs:
       - get
       - list
       - apiGroups:
       - apps
       resources:
       - deployments
       - statefulsets
       verbs:
       - get
       - list
       - apiGroups:
       - "edws.cloudera.com"
       resources:
       - computes
       verbs:
       - get
       - list

2) Run the following command to apply the permissions:

kubectl apply -f <filename>

CDPD-40730 Parquet change can cause incompatibility

Parquet files written by the parquet-mr library in this version of CDW, where the schema contains a timestamp with no UTC conversion will not be compatible with older versions of Parquet readers. The effect is that the older versions will still consider these timestamps as they would require UTC conversions and will thus end up with a wrong result. You can encounter this problem only when you write Parquet-based tables using Hive, and tables have the non-default configuration hive.parquet.write.int64.timestamp=true.

DWX-10271: Missing log section in Hive query results

In a Hive Virtual Warehouse, when you run a query in Hue, the query results do not contain a logs section.

DWX-8118: INSERT INTO command fails under certain circumstances

This problem affects users who have a PostgreSQL database as the backend Hive database. If you create a table A and create a table B as select (CTAS) from an empty table A, inserting values into table B fails as follows:

Error while compiling statement: FAILED: Execution Error, return code 1 from 
       org.apache.hadoop.hive.ql.exec.StatsTask.org.apache.thrift.transport.TTransportException

Workaround: Disable auto-stats gathering: Go to Cloudera Manager Data Warehouse > Virtual Warehouses, and click the Hive VW name in the list. In Configuration > HiveServer2, set hive.cbo.enable to false.

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-5926: Cloning an existing Hive Virtual Warehouse fails

Problem: If you have an existing Hive Virtual Warehouse that you clone by selecting Clone from the drop-down menu, the cloning process fails. This does not apply to creating a new Hive Virtual Warehouse.

Workaround: Make the following configuration change to resolve this issue:

1. In the Hive Virtual Warehouse tile, click the edit icon. This launches the Virtual Warehouse details page.
2. In the details page for the Virtual Warehouse, click the Configurations tab.
3. Click the Hiveserver2 sub-tab.
4. Select hive-site from the configuration file drop-down list menu.
5. Search for the configuration property hive.metastore.sasl.enabled.
6. Set the hive.metastore.sasl.enabled configuration property to true.
7. Click Apply in the upper right corner of the page to save the configuration.
8. Click the Actions menu and select Clone to clone the Hive Virtual Warehouse:

   

DWX-2690: Older versions of Beeline return SSLPeerUnverifiedException when submitting a query

Problem: When submitting queries to Virtual Warehouses that use Hive, older Beeline clients return an SSLPeerUnverifiedException error:

javax.net.ssl.SSLPeerUnverifiedException: Host name ‘ec2-18-219-32-183.us-east-2.compute.amazonaws.com’ does not
       match the certificate subject provided by the peer (CN=*.env-c25dsw.dwx.cloudera.site) (state=08S01,code=0)

Workaround: Only use Beeline clients from CDP Runtime version 7.0.1.0 or later.

Carried over from the previous release: Hue Query Editor

TSB 2023-670: Hue frontend may become stuck in CrashLoopBackoff on CDW running on Azure

Hue frontend for Apache Impala (Impala) and Apache Hive (Hive) Virtual Warehouses created in Cloudera Data Warehouse (CDW) can be stuck in a CrashLoopBackoff state on Microsoft Azure (Azure) platform, making it impossible to reach the Virtual Warehouse through Hue. In this case, the following error message is displayed: kubelet Error: failed to create containerd task: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: exec: “run_httpd.sh”: cannot run executable found relative to current directory: unknown

The root cause of the issue is a recent node image upgrade in Azure made by Microsoft, where the version of the container runtime (containerd) was upgraded to 1.6.18. This version upgraded Go SDK to 1.19.6, where the behavior of how program execution works has changed. Due to security concerns, the newer version of Go SDK does not resolve a program using an implicit or explicit path entry relative to the current directory (for more information, see the Go documentation), and containerd indirectly uses this Go exec API. The Docker command of the Hue frontend relies on the former behavior. Therefore the command fails on recent node images, because it cannot find the expected executable in the current working directory of the containers anymore. Cloudera first noticed the aforementioned containerd version in the Azure Kubernetes Service (AKS) released on 2023-03-05. Every node image which is newer than the version released on 2023-03-05 is affected by this issue. Unfortunately, Cloudera does not have any insight to when Microsoft rolls out new node images in a given region. Therefore, it is possible that in some regions, the older node images are still in use, where the issue does not arise until a given regional update is applied to the node images.

CDW environments, which are already activated and running, are not affected as long as customers do not trigger a node image upgrade to the latest available version either using Azure Command Line Interface (CLI) or on the Azure portal. If the node image is upgraded to the latest version, then the Virtual Warehouses also need to be upgraded to the latest CDWH-2023.0.14.0 version. Newly created CDW environments are not affected, but customers are advised to not choose a Hue version lower than CDWH-2023.0.14.0 during any Virtual Warehouse creation because such a configuration is affected by this issue.

Knowledge article

For the latest update on this issue see the corresponding Knowledge article: TSB 2023-670: TSB Hue frontend may become stuck in CrashLoopBackoff on CDW running on Azure

IMPALA-11447 Selecting certain complex types in Hue crashes Impala

Queries that have structs/arrays in the select list crash Impala if initiated by Hue.

Workaround: Do not select structs/arrays in Hue.

DWX-8460: Unable to delete, move, or rename directories within the S3 bucket from Hue

Problem: You may not be able to rename, move, or delete directories within your S3 bucket from the Hue web interface. This is because of an underlying issue, which will be fixed in a future release.

Workaround: You can move, rename, or delete a directory using the HDFS commands as follows:

1. SSH into your CDP environment host.
2. To delete a directory within your S3 bucket, run the following command:

   hdfs dfs -rm -r [***COMPLETE-PATH-TO-S3-BUCKET***]/[***DIRECTORY-NAME***]

3. To rename a folder, create a new directory and run the following command to move files from the source directory to the target directory:

   hdfs dfs -mkdir [***DIRECTORY-NAME***]

   hdfs dfs -mv [***COMPLETE-PATH-TO-S3-BUCKET***]/[***SOURCE-DIRECTORY***] [***COMPLETE-PATH-TO-S3-BUCKET***]/[***TARGET-DIRECTORY***]

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-5650: Hue only makes the first user a superuser for all Virtual Warehouses within a Data Catalog

Problem: Hue marks the user that logs in to Hue from a Virtual Warehouse for the first time as the Hue superuser. But if multiple Virtual Warehouses are connected to a single Data Catalog, then the first user that logs in to any one of the Virtual Warehouses within that Data Catalog is the Hue superuser.

For example, consider that a Data Catalog DC-1 has two Virtual Warehouses VW-1 and VW-2. If a user named John logs in to Hue from VW-1 first, then he becomes the Hue superuser for all the Virtual Warehouses within DC-1. At this time, if Amy logs in to Hue from VW-2, Hue does not make her a superuser within VW-2.

None.

Iceberg

DEX-7946 Data loss during migration of a Hive table to Iceberg

In this release, by default the table property 'external.table.purge' is set to true, which deletes the table data and metadata if you drop the table during migration from Hive to Iceberg.

Workarounds: Either one of the following workarounds prevents data loss during table migration:

• Set the table property 'external.table.purge'='FALSE'.
• Do not drop a table during migration from Hive to Iceberg.

DWX-13733 Timeout issue querying Iceberg tables from Hive

A timeout issue can cause the query to fail.

Workaround: Add the following configuration to hadoop-core-site for the Database Catalog and the Virtual Warehouse.

fs.s3.maxConnections=1000
fs.s3a.connection.maximum=1000

Restart the Database Catalog and Virtual Warehouse.

DWX-13062 Hive-26507 Converting a Hive table having CHAR or VARCHAR columns to Iceberg causes an exception

CHAR and VARCHAR data can be shorter than the length specified by the data type. Remaining characters are padded with spaces. Data is converted to a string in Iceberg. This process can yield incorrect results when you query the converted Iceberg table.

Workaround: Change columns from CHAR or VARCHAR to string types before converting the Hive table to Iceberg.

DWX-13276 Multiple inserts into tables having different formats can cause a deadlock.

Under the following conditions, a deadlock can occur:

• You run a query to insert data into multiple tables comprised of at least one Iceberg table and at least one non-Iceberg table.
• The STAT task locking feature is turned on (default = on).

Workarounds: Perform either one of the following workarounds:

• Run separate queries to insert data into only one table at a time.
• Turn off STAT task locking as follows:

  set iceberg.hive.request-lock-on-stats-task=false;

Carried over from the previous release: Impala Virtual Warehouse

IMPALA-11045 Impala Virtual Warehouses might produce an error when querying transactional (ACID) table even after you enabled the automatic metadata refresh (version DWX 1.1.2-b2008)

Problem: Impala doesn't open a transaction for select queries, so you might get a FileNotFound error after compaction even though you refreshed the metadata automatically.

Workaround: Run the INVALIDATE METADATA statement on the transactional (ACID) table to refresh the metadata. This fixes the problem until the next compaction occurs. For information about running this statement, see INVALIDATE METADATA statement.

Impala Virtual Warehouses might produce an error when querying transactional (ACID) tables (DWX 1.1.2-b1949 or earlier)

Problem: If you are querying transactional (ACID) tables with an Impala Virtual Warehouse and compaction is run on the compacting Hive Virtual Warehouse, the query might fail. The compacting process deletes files and the Impala Virtual Warehouse might not be aware of the deletion. Then when the Impala Virtual Warehouse attempts to read the deleted file, an error can occur. This situation occurs randomly.

Workaround: Run the INVALIDATE METADATA statement on the transactional (ACID) table to refresh the metadata. This fixes the problem until the next compaction occurs. For information about running this statement, see INVALIDATE METADATA statement.

Do not use the start/stop icons in Impala Virtual Warehouses version 7.2.2.0-106 or earlier

Problem: If you use the stop/start icons in Impala Virtual Warehouses version 7.2.2.0-106 or earlier, it might render the Virtual Warehouse unusable and make it necessary for you to re-create it.

Workaround: Do not use the stop/start icons in these older Virtual Warehouses. Instead, these older versions automatically suspend and resume the Impala executors depending on the absence or presence of queries, making manual start or stop unnecessary.

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 executor, multiplied by the total number of executors.

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.