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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

dbr_data_engg
by • New Contributor III
  • 5906 Views
  • 3 replies
  • 3 kudos

Resolved! Unable to deploy Databricks Asset Bundle

Hi Team,I created a workflow/job and was able to deploy to Dev and Prod workspaces. But now I am unable to deploy job to "Dev" workspace and getting below error, [Also unable to see this job on Databricks UI]Deploying resources...Updating deployment ...

  • 5906 Views
  • 3 replies
  • 3 kudos
Latest Reply
fabiobeider
New Contributor II
  • 3 kudos

Hey, I'm facing the same issueDid you ever get a chance to solve it?

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Yuki
by • Contributor
  • 2524 Views
  • 1 replies
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Is it possible to retain original deltatable data with Unity Catalog?

Hi everyone,I have a question regarding data retention in Unity Catalog. In the pre–Unity Catalog setup, I believe that even if we dropped an external table, the underlying data files remained intact.However, in the current best practices for Unity C...

  • 2524 Views
  • 1 replies
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Latest Reply
mani_22
Databricks Employee
  • 0 kudos

Hi @Yuki,  If you drop an external table, the underlying data remains accessible even now. Only the table definition is removed from the metastore, while the actual data is retained. The UNDROP command for an EXTERNAL table simply recreates the table...

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SakthiGanesh
by • New Contributor II
  • 1816 Views
  • 2 replies
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Delta table partition folder names is getting changed

I am facing an issue where the expected date partition folder should be named in format like "campaign_created_date=2024-01-17", but instead it is writing as "ad", "8B" looks like a random folder names.Usually it will be like below:Now it changed lik...

SakthiGanesh_0-1751013736357.png SakthiGanesh_1-1751013840570.png
  • 1816 Views
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Krishnamatta
Contributor
  • 0 kudos

Hi Satish,This is due to the column mapping enabled on the tableFrom Databricks Docs:When you enable column mapping for a Delta table, random prefixes replace column names in partition directories for Hive-style partitioning. See Rename and drop colu...

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Ganeshch
by • New Contributor III
  • 3729 Views
  • 6 replies
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No option to create cluster

I don't see any option to create cluster inside compute .How to create cluster ? Please help me

  • 3729 Views
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Latest Reply
nayan_wylde
Esteemed Contributor II
  • 0 kudos

Yes if you are using legacy community version you will be able to create clusters but with free edition it is limited serverless compute

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Dewlap
by • New Contributor II
  • 1669 Views
  • 1 replies
  • 1 kudos

How to handle exploded records with overwrite-by-key logic in Delta Live Tables

 I'm using Delta Live Tables (DLT) with the apply_changes API to manage SCD Type 1 on a source table. However, I’ve run into a limitation.Context:After apply_changes, I have a derived view that:Flattens and explodes a JSON array field in the source d...

  • 1669 Views
  • 1 replies
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Brahmareddy
Esteemed Contributor II
  • 1 kudos

Hi Dewlap,How are you doing today? As per my understanding, You're right to notice that apply_changes in DLT works best for one-row-per-key updates and doesn't fit well when you need to replace multiple rows for the same key, especially after explodi...

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Sreejuv
by • Databricks Partner
  • 2619 Views
  • 1 replies
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Lakebridge code conversion

m currently working on a proof of concept to convert Oracle & Synapse procedures into Databricks SQL  and none of these are getting converted. followed the steps mentioned in documentation . Wanted to check any one able to sucvessfuly convert and exe...

  • 2619 Views
  • 1 replies
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lingareddy_Alva
Esteemed Contributor
  • 0 kudos

Hi @Sreejuv You're encountering a very common challenge. Oracle and Synapse to Databricks SQL procedure conversion is notoriously difficult, and many organizations struggle with this.Common Issues with Automated ConversionWhy procedures often fail to...

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AdamIH123
by • New Contributor III
  • 2913 Views
  • 1 replies
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Resolved! Agg items in a map

What is the best way to aggregate a map across rows? In the below, The agg results would be red: 4, green 7, blue: 10. This can be achieved using explode wondering if there is a better way. %sql with cte as ( select 1 as id , map('red', 1, 'green...

  • 2913 Views
  • 1 replies
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SP_6721
Honored Contributor II
  • 0 kudos

Hi @AdamIH123 ,The explode-based approach is widely used and remains the most reliable and readable method.But if you're looking for an alternative without using explode, you can try the REDUCE + MAP_FILTER approach. It lets you aggregate maps across...

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seefoods
by • Valued Contributor
  • 2552 Views
  • 1 replies
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asset bundle

Hello Guys, Actually, i build a custom asset bundle  config, but i have a issue when i create several sub directories inside resources directory. After running the command databricks bundle summary, databricks librairies mentionned that resources its...

  • 2552 Views
  • 1 replies
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Latest Reply
Renu_
Valued Contributor II
  • 0 kudos

Hi @seefoods, databricks asset bundles don’t automatically detect resources in subdirectories unless they’re explicitly listed or a recursive pattern is used in the config.To resolve this, you can update the include section with a pattern like resour...

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frosti_pro
by • New Contributor II
  • 1978 Views
  • 3 replies
  • 1 kudos

UC external tables to managed tables

Dear community, I would like to know if there are any procedure and/or recommendation to safely and efficiently migrate UC external tables to managed tables (in a production context with high volume of data)? Thank you for your support!

  • 1978 Views
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  • 1 kudos
Latest Reply
ElizabethB
Databricks Employee
  • 1 kudos

Please check out our new docs page! This has some information which may help you, including information about our new SET MANAGED command. We are also looking to make this process smoother over time, so if you have any feedback, please let us know. h...

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suk
by • New Contributor II
  • 1463 Views
  • 1 replies
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Databricks pipeline script is not creating schema before creation of table

Hello We are facing some issue while executing the databricks pipeline i.e it takes all scripts in random sequence, and if no schema was created before it scheduled a job to create table it'll failAs a alternative we are executing  schema pipeline fi...

  • 1463 Views
  • 1 replies
  • 0 kudos
Latest Reply
lingareddy_Alva
Esteemed Contributor
  • 0 kudos

Hi @suk This is a common issue with Databricks pipelines where dependencies aren't properly managed, causing scripts to execute in random order. Use Databricks Workflows with Task DependenciesConfigure explicit task dependencies: 

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Ganeshch
by • New Contributor III
  • 2315 Views
  • 3 replies
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No option to create cluster

I don't see any option to create cluster inside compute in community edition, is it disable? .How to create cluster ? Please help me

  • 2315 Views
  • 3 replies
  • 0 kudos
Latest Reply
Ganeshch
New Contributor III
  • 0 kudos

If i create notebook and run it , explicitly cluster will not be created but it will work in the backend , am i right?

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ghilage
by • New Contributor III
  • 1956 Views
  • 4 replies
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Not able to write to dbfs from workflow

Hi All,I am facing below issue while writing to dbfs.I have a pyspark code in which I am writing a dataframe to dbfs using below code :dbfs_path.mkdir(parents=True, exist_ok=True)my_df.write.format("parquet").mode("overwrite").save(f"{dbfs_path}/my_d...

  • 1956 Views
  • 4 replies
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Latest Reply
ghilage
New Contributor III
  • 0 kudos

looks like some problem withing my dataframe itself.If i skip some of the expensive field calculations then it is able to write to dbfs.

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Davila
by • New Contributor II
  • 2523 Views
  • 2 replies
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Resolved! Asset Bundle Validation Not Completing – Stuck on files_to_sync

I have a Databricks asset bundle with the following structure:bundle: name: <some value here> uuid: <some value here> include: - resources/*.yml variables: catalog_bronze: {} catalog_silver: {} user_name: {} targets: dev: mode: ...

  • 2523 Views
  • 2 replies
  • 2 kudos
Latest Reply
Renu_
Valued Contributor II
  • 2 kudos

Hi @Davila, Validation can be slow if your bundle root includes a large number of files. However, since your bundle contains only a few files, the delay may be due to the root_path pointing to a broader directory structure in the Databricks workspace...

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ashraf1395
by • Honored Contributor
  • 3913 Views
  • 6 replies
  • 2 kudos

Empty Streaming tables in dlt

I want to create empty streaming tables in dlt with only schema specified. Is it possible ?I want to do it in dlt python.

  • 3913 Views
  • 6 replies
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Latest Reply
brunoillipronti
New Contributor II
  • 2 kudos

I confirm that ashraf1395 solution works. All approaches I tried (of creating an empty table) created a materialized view (which you can't merge). It's disappointing though, since there is no quick param in a "create_table" command to create a simple...

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Zachary_Higgins
by • Contributor
  • 18035 Views
  • 9 replies
  • 13 kudos

ignoreDeletes' option with Delta Live Table streaming source

We have a delta streaming source in our delta live table pipelines that may have data deleted from time to time. The error message is pretty self explanatory:...from streaming source at version 191. This is currently not supported. If you'd like to i...

  • 18035 Views
  • 9 replies
  • 13 kudos
Latest Reply
IanB_Argento
New Contributor II
  • 13 kudos

I had this same issue whilst doing some POC work. I was able to overcome it as follows:Navigate to Workflows | Jobs & pipelines.Select your pipeline.Click the drop-down next to the Start button.Choose "Full refresh all".That resets it all and fixes t...

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