Known issues and limitations

Learn about the known issues in Flink and SQL Stream Builder, the impact or changes to the functionality, and the workaround in Cloudera Streaming Analytics 1.10.0.

SQL Stream Builder

CSA-4858 - Kerberos encryption type detection does not always work correctly for SSB
SSB detects no supported encryption types even though there is a list of allowed encryption types in the krb5.conf file. This causes an error when generating keytabs from the principal and password pair.
  1. Run ktutil on your cluster.
  2. Change the configuration with the following commands:
    addent -password -p <username> -k 1 -e aes256-cts
    wkt /tmp/new_keytab.keytab
  3. Upload the new keytab on Streaming SQL Console.
CSA-4800 - ToString of Job can cause stack overflow
The jobLogItems can cause stack overflow errors when toString is called.
CSA-4799 - Table Metadata is not saved when job is run via sql/execute
The SqlExecutorService.persistIfNeededAndExecute does not save the table metadata before executing the SQL job, therefore the data cleaner of the Materialized View Engine does not clean up the data based on the retention settings.
CSA-4699 - Keytab upload starts failing in SSB after some time, requiring a restart
The /tmp/ssb_keytab_work_dir is removed after a period of time and SSB can no longer create keytabs as the directory does not exist anymore.
Restart the SSB service to recreate the directory for the keytabs.
CSA-4650: Inconsistent sidebar collapse behavior
The sidebar is collapsed inconsistently on the homepage of Streaming SQL Console when opening a project.
Limitations when configuring widgets
The following widget configuration optionns are not available for certain widgets on Streaming SQL Console:
  • Gauge visualization type: Expand on hover, Unit
  • Donut visualization type: Expand on hover, Title
  • Pie visualization type: Expand on hover
Upgrading to CSA 1.10 requires additional step
When upgrading to Streaming Analytics 1.10, the Update Admin Database step will fail during the upgrade process.
Select Repair Admin Database when the Update Admin Database process fails, and then complete the Update Admin Database process again.
Auto discovery is not supported for Apache Knox
You need to manually configure Knox with SQL Stream Builder to enable Knox authentication.
Complete the configuration based on the CDP Private Cloud Base version you use. For more information, see the Enabling Knox authentication for SSB documentation.
CSA-5006 - SSB service fails when using Active Directory (AD) Kerberos authentication
If you use AD Kerberos for authentication and the Load Balancer URL is not provided, it can cause the SQL Stream Builder (SSB) service to fail. The issue is caused by the keytab generation. When the keytab is generated by Cloudera Manager it requires the principals from the AD for the Load Balancer host, and without no host specified for the Load Balancer, the SSB service cannot be started by Cloudera Manager. This issue also persists when the Load Balancer role is not deployed or used with SSB.
Fill out the Load Balancer URL parameter in Cloudera Manager regardless of using Load Balancer with SSB. For more information, see the Enabling High Availability for SSB documentation.


In Cloudera Streaming Analytics, the following SQL API features are in preview:
  • Match recognize
  • Top-N
  • Stream-Table join (without rowtime input)
DataStream conversion limitations
  • Converting between Tables and POJO DataStreams is currently not supported in CSA.
  • Object arrays are not supported for Tuple conversion.
  • The java.time class conversions for Tuple DataStreams are only supported by using explicit TypeInformation: LegacyInstantTypeInfo, LocalTimeTypeInfo.getInfoFor(LocalDate/LocalDateTime/LocalTime.class).
  • Only java.sql.Timestamp is supported for rowtime conversion, java.time.LocalDateTime is not supported.
Kudu catalog limitations
    • Primary keys can only be set by the kudu.primary-key-columns property. Using the PRIMARY KEY constraint is not yet possible.
    • Range partitioning is not supported.
  • When getting a table through the catalog, NOT NULL and PRIMARY KEY constraints are ignored. All columns are described as being nullable, and not being primary keys.
  • Kudu tables cannot be altered through the catalog other than simply renaming them.
Schema Registry catalog limitations
  • Currently, the Schema Registry catalog / format only supports reading messages with the latest enabled schema for any given Kafka topic at the time when the SQL query was compiled.
  • No time-column and watermark support for Registry tables.
  • No CREATE TABLE support. Schemas have to be registered directly in the SchemaRegistry to be accessible through the catalog.
  • The catalog is read-only. It does not support table deletions or modifications.
  • By default, it is assumed that Kafka message values contain the schema id as a prefix, because this is the default behaviour for the SchemaRegistry Kafka producer format. To consume messages with schema written in the header, the following property must be set for the Registry client: true.