Cloudera Docs

Known Issues in Hue

Learn about the known issues in Hue, the impact or changes to the functionality, and the workaround.

Known issues in 7.2.17

CDPD-56888: Renaming a folder with special characters results in a duplicate folder with a new name on AWS S3.
On AWS S3, if you try to rename a folder with special characters in its name, a new folder is created as a copy of the original folder with its contents. Also, you may not be able to delete the folder containing special characters.
You can rename or delete a directory having special characters 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***]
CDPD-48146: Error while browsing S3 buckets or ADLS containers from the left-assist panel
You may see the following error while trying to access the S3 buckets or ADLS containers from the left-assist panel in Hue: Failed to retrieve buckets: :1:0: syntax error.
Access the S3 buckets or ADLS containers using the File Browser.
CDPD-54376: Clicking the home button on the File Browser page redirects to HDFS user directory
When you are previewing a file on any supported filesystem, such as S3 or ABFS, and you click on the Home button, you are redirected to the HDFS user home directory instead of the user home directory on the said filesystem.
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Technical Service Bulletins

TSB 2023-704: File corruption when downloading files larger than 1 MB from ABFS with Hue File Browser
An issue within the upstream Apache Hue (Hue) application results in file corruption when downloading files larger than 1MB files from Azure Blob Filesystem (ABFS) using the Hue File Browser. Only the downloaded files are affected by this issue, the source files remain intact.
Knowledge article
For the latest update on this issue, see the corresponding Knowledge article: TSB 2023-704: File corruption when downloading files larger than 1 MB from ABFS with Hue File Browser
TSB 2023-703: Risk of Data Loss when using Hue S3 File Browser
There is a risk of losing data when moving one or more files or folders in Amazon S3 storage with the Hue File Browser. When the user selects the destination folder in the modal window the following scenarios can occur:
  1. If the user selects the same destination folder as the source folder, and clicks the Move button, the selected files will be permanently deleted.
  2. If the user selects a different destination folder from the source folder and clicks the Move button before the User Interface (UI) has completely loaded (the loading is indicated by a spinner), the action could lead to the following outcomes:
    1. If the previously visible destination folder was the same as the source folder, the file will be permanently deleted.
    2. If the previously visible destination folder was different from the source folder, the file(s) will be moved to the previously visible destination folder and not to the intended destination folder.
Knowledge article
For the latest update on this issue, see the corresponding Knowledge article: TSB 2023-703: Risk of Data Loss when using Hue S3 File Browser

Known issues in 7.2.16

CDPD-54714: SSO does not work while logging in from the Hue UI
Due to a missing configuration in Cloudera Manager, SSO does not work when you have enabled Knox as an authentication backend and when Hue is in HA mode.
See Authenticating Hue users with Knox SSO.
CDPD-41136: Importing files from the local workstation is disabled by default
Cloudera has disabled the functionality to import files from your local workstation into Hue because it may cause errors. You may not see the Local File option in the Type drop-down menu on the Importer page by default.
You can enable the functionality to import files from your local workstation by specifying the following parameter in the Hue Service Advanced Configuration Snippet (Safety Valve) for hue_safety_valve.ini field using Cloudera Manager:
[indexer]
enable_direct_upload=true
CDPD-42619: Unable to import a large CSV file from the local workstation
You may see an error message while importing a CSV file into Hue from your workstation, stating that you cannot import files of size more than 200 KB.
Upload the file to S3 or ABFS and then import it into Hue using the Importer.
CDPD-43293: Unable to import Impala table using Importer
Creating Impala tables using the Hue Importer may fail.
If you have both Hive and Impala services installed on your cluster, then you can import the table using by selecting the Hive dialect from Tables > Sources. If only Impala service is installed on your cluster, then go to Cloudera Manager > Clusters > Hue > Configurations and add the following line in the Hue Service Advanced Configuration Snippet (Safety Valve) for hue_safety_valve.ini field:
[beeswax]
max_number_of_sessions=1

Known issues before 7.2.16

CDPD-58978: Batch query execution using Hue fails with Kerberos error
When you run Impala queries in a batch mode, you enounter failures with a Kerberos error even if the keytab is configured correctly. This is because submitting Impala, Sqoop, Pig, or pyspark queries in a batch mode launches a shell script Oozie job from Hue and this is not supported on a secure cluster.
There is no workaround. You can submit the queries individually.
Hue Importer is not supported in the Data Engineering template
When you create a Data Hub cluster using the Data Engineering template, the Importer application is not supported in Hue.
Figure 1. Hue web UI showing Importer icon on the left assist panel


Unsupported features

CDPD-59595: Spark SQL does not work with all Livy servers that are configured for High Availability
SparkSQL support in Hue with Livy servers in HA mode is not supported. Hue does not automatically connect to one of the Livy servers. You must specify the Livy server in the Hue Advanced Configuration Snippet as follows:
[desktop]
[spark]
livy_server_url=http(s)://[***LIVY-FOR-SPARK3-SERVER-HOST***]:[***LIVY-FOR-SPARK3-SERVER-PORT***]
Moreover, you may see the following error in Hue when you submit a SparkSQL query: Expecting value: line 2 column 1 (char 1). This happens when the Livy server does not respond to the request from Hue.
Specify all different Livy servers in the livy_server_url property one at a time and use the one which does not cause the issue.
Importing and exporting Oozie workflows across clusters and between different CDH versions is not supported

You can export Oozie workflows, schedules, and bundles from Hue and import them only within the same cluster if the cluster is unchanged. You can migrate bundle and coordinator jobs with their workflows only if their arguments have not changed between the old and the new cluster. For example, hostnames, NameNode, Resource Manager names, YARN queue names, and all the other parameters defined in the workflow.xml and job.properties files.

Using the import-export feature to migrate data between clusters is not recommended. To migrate data between different versions of CDH, for example, from CDH 5 to CDP 7, you must take the dump of the Hue database on the old cluster, restore it on the new cluster, and set up the database in the new environment. Also, the authentication method on the old and the new cluster should be the same because the Oozie workflows are tied to a user ID, and the exact user ID needs to be present in the new environment so that when a user logs into Hue, they can access their respective workflows.

INSIGHT-3707: Query history displays "Result Expired" message
You see the "Result Expired" message under the Query History column on the Queries tab for queries which were run back to back. This is a known behaviour.
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