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Data Engineering
Join discussions on data engineering best practices, architectures, and optimization strategies within the Databricks Community. Exchange insights and solutions with fellow data engineers.
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Forum Posts

abhijitnag
by New Contributor II
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Materialize View creation not supported from DLT Pipeline

Hi Team, I have a very basic scenario where I am using my custom catalog and want materialize view to get created from DLT table at the end of pipeline. The SQL used as below for the same.where "loom_data_transform" is a Streaming table. But pipeline...

abhijitnag_1-1704047659613.png abhijitnag_0-1704047565470.png
Data Engineering
Delta Live Table
dlt
Unity Catalog
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warsamebashir
New Contributor II
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Hey @abhijitnag are you sure your loom_data_transform was created as a STREAMING table? docs:https://docs.databricks.com/en/sql/language-manual/sql-ref-syntax-ddl-create-streaming-table.html    

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Pavani22
by New Contributor
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Registered for Wrong certification

Hi, I am registered for databricks certification today at 23:00hr and I accidentally choose databricks data analyst certification instead of databricks data engineer associate.I have left several mails and submitted several forms to be able to fix th...

  • 1266 Views
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naveenprasanth
by New Contributor
  • 4489 Views
  • 1 replies
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Issue with Reading MongoDB Data in Unity Catalog Cluster

I am encountering an issue while trying to read data from MongoDB in a Unity Catalog Cluster using PySpark. I have shared my code below: from pyspark.sql import SparkSession database = "cloud" collection = "data" Scope = "XXXXXXXX" Key = "XXXXXX-YYY...

Data Engineering
mongodb
spark config
Spark Connector package
Unity Catalog
  • 4489 Views
  • 1 replies
  • 1 kudos
Latest Reply
Wojciech_BUK
Valued Contributor III
  • 1 kudos

Few points 1. chce if you installed exactly same driver version as you are pointing this in code (2.12:3.2.0) it has to match 100percentorg.mongodb.spark:mongo-spark-connector_2.12:3.2.02. I have seen people configuring  connction to atlas in two way...

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Learnit
by New Contributor II
  • 3228 Views
  • 1 replies
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Unable to locate "Configure databricks" in visual studio code

Need help in locating "configure databricks" option to connect to a cluster in visual studio code. Not sure which settings need to enabled to view/access the configuration. Below is the screen shot of it.

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Learnit
New Contributor II
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NivRen
by New Contributor
  • 2418 Views
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Dashboard HTML Export: DisplayHTML Formatting Lost

I am building an analytics dashboard that we plan to export into HTML to provide to clients. We are running into major issues specifically with DisplayHTML visualizations. We are using DisplayHTML for help text, sub-headings, and for a KPI banner at ...

Data Engineering
dashboard
DisplayHTML
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dzmitry_tt
by New Contributor
  • 5157 Views
  • 1 replies
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DeltaRuntimeException: Keeping the source of the MERGE statement materialized has failed repeatedly.

I'm using Autoloader (in Azure Databricks) to read parquet files and write their data into the Delta table.schemaEvolutionMode is set to 'rescue'.In foreach_batch I do1) Transform of read dataframe;2) Create temp view based on read dataframe and merg...

Data Engineering
autoloader
MERGE
streaming
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Latest Reply
Wojciech_BUK
Valued Contributor III
  • 0 kudos

Hmm, you can't have duplicated data in source dataframe/batch but it should error out with diffrent erro like "Cannot perform Merge as multiple source rows matched and attempted to modify the same target row...".Also this behaviour after rerun is str...

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EDDatabricks
by Databricks Partner
  • 4445 Views
  • 1 replies
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Slow stream static join in Spark Structured Streaming

SituationRecords are streamed from an input Delta table via a Spark Structured Streaming job. The streaming job performs the following.Read from input Delta table (readStream)Static join on small JSONStatic join on big Delta tableWrite to three Delta...

EDDatabricks_1-1703760391974.png
Data Engineering
Azure Databricks
optimization
Spark Structured Streaming
Stream static join
  • 4445 Views
  • 1 replies
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Latest Reply
Wojciech_BUK
Valued Contributor III
  • 0 kudos

You have quite small machines that you are using, please take into consideration that a lot of memory of machine is occupied by other processes https://kb.databricks.com/clusters/spark-shows-less-memoryThis is not good idea to broadcast huge data fra...

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Erik
by Valued Contributor III
  • 17549 Views
  • 4 replies
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Resolved! How to run code-formating on the notebooks

Has anyone found a nice way to run code-formating (like black) on the notebooks **in the workspace**? My current workflow is to commit the file, pull it locally, format, repush and pull. It would be nice if it was some relatively easy way to run blac...

  • 17549 Views
  • 4 replies
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Latest Reply
MartinPlay01
New Contributor II
  • 3 kudos

Hi Erik,I don't know if you are aware of this feature, currently there is an option to format the code in your databricks notebooks using the black code style formatter.Just you need to either have a version of your DBR equal to or greater than 11.2 ...

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XClar_40456
by New Contributor
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  • 2 replies
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Resolved! Are there system tables that are customer accessible for setting up job run health monitoring in GCP Databricks?

Is Overwatch still an active project, is there anything equivalent for GCP Databricks or any plans for Overwatch to be available in GCP? 

  • 2823 Views
  • 2 replies
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Latest Reply
SriramMohanty
Databricks Employee
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Yes overwatch supports GCP.

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rt-slowth
by Contributor
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Help design my streaming pipeline

###Data Source- AWS RDS- Database migration tasks have been created using AWS DMS- Relevant cdc information is being stored in a specific bucket in S3### Data frequency- Once a day (but not sure when, sometime after 6pm)### Development environment- d...

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RabahO
by New Contributor III
  • 3121 Views
  • 1 replies
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Handling data close to SCD2 with Delta tables

Hello, stack used: pyspark and delta tablesI'm working with some data that look a bit like SCD2 data.Basically, the data has columns that represent an id, a rank column and other informations, here's an example:login, email, business_timestamp => the...

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  • 1 replies
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Latest Reply
Wojciech_BUK
Valued Contributor III
  • 0 kudos

Your problem is exactly like SCD2 . You just add one more column with valid to date ( optionals you can add flag is actual to tag current records)You can use DLT apply changes syntax. Alternatively Merge statement .On the top of that table you can bu...

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Aidin
by New Contributor II
  • 9585 Views
  • 4 replies
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BINARY data type

Hello everyone.I'm trying to understand how BINARY data type works in spark sql. According to examples in the documentation, using cast or literal 'X' should return HEX representation of the binary data type, but when I try the same code, I see base6...

Screenshot 2023-12-22 at 19.55.15.png
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  • 4 replies
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Latest Reply
Wojciech_BUK
Valued Contributor III
  • 0 kudos

If you are confused , please look at this thread, they explain that Databricks use base64 as binary default. This is not documented but can be tracked at source code level.https://stackoverflow.com/questions/75753311/not-getting-binary-value-in-datab...

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