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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

gtyhchang
by • New Contributor II
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pandas issue

We identify a potential bug in either DBFS or Pandas that when writting a dataframe using Pandas `to_csv`, `to_parquet`, `to_pickle` etc to a mounted ADLS location with read-only service principle didn't throw permission deny exceptions. However, met...

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Anonymous
Not applicable
  • 1 kudos

Hi @Yung-Hang Chang​ Hope all is well! Just wanted to check in if you were able to resolve your issue and would you be happy to share the solution or mark an answer as best? Else please let us know if you need more help. We'd love to hear from you.Th...

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Databricks3
by • Contributor
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Concurrent Insert on a delta table fails if the table contains Identity Columns. Error message are added below.MetadataChangedException: The metadata ...

Concurrent Insert on a delta table fails if the table contains Identity Columns. Error message are added below.MetadataChangedException: The metadata of the Delta table has been changed by a concurrent update. Please try the operation again.

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Anonymous
Not applicable
  • 1 kudos

Hi @SK ASIF ALI​ Great to meet you, and thanks for your question! Let's see if your peers in the community have an answer to your question. Thanks.

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Susheel
by • New Contributor II
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We have concern with respect to the feasibility of installing the Databricks runtime supported version on-premise. This is because we are planning to...

We have concern with respect to the feasibility of installing the Databricks runtime supported version on-premise. This is because we are planning to migrate the existing Azure Databricks application code to an on-premise environment based on the cl...

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Susheel
New Contributor II
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Any update?

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Chhaya
by • New Contributor III
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DLT config/setting json support

hi team,There used to be option to provide DLT pipeline settings either via UI or JSON, but I do not see it anymore after switching to new UI. Is this something expected ? am I missing something ? here is screenshot for reference.

image
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User16752245772
Databricks Employee
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Hi @Chhaya Vishwakarma​ This option is available, could you please clear the browser cache and try ? or can you try in an incognito window?

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ChrisS
by • New Contributor III
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Trying to mount Azure Data Lake Storage Gen 2 to Azure Databricks

I have validated many many many times all my credentials and I am still getting the following error (at the very end). ChatGPT said to basically recheck everything and I did. The one thing I didn't do was grant the permissions which I have since done...

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User16752245772
Databricks Employee
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Hi @Chris Sarrico​ Could you please specify the container name before the storage account name like this :so the source looks like this. :source = "abfss://<container-name>@<storage-account-name>.dfs.core.windows.net/"https://learn.microsoft.com/en-u...

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kyzers0ze
by • New Contributor
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0 byte files appearing in blob storage

When writing out files to azure blob storage using spark there are some 0 byte files being created on the web portal but not when I view it using storage explorer.I was wondering if there is there any work around for this?

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Anonymous
Not applicable
  • 0 kudos

Hi @Ryan Low​ Great to meet you, and thanks for your question! Let's see if your peers in the community have an answer to your question. Thanks.

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ssaloni_bhatia
by • New Contributor
  • 2349 Views
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Spark read not working in parallel

Hi All,Am trying to run a spark jdbc query and the read is running on only 1 worker and is taking a lot of time. Usually, it takes 4 minutes in aws lambda but now it is taking approx 10 minutes while using databricks. There are only 4m records (write...

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Anonymous
Not applicable
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Hi @Saloni Bhatia​ Great to meet you, and thanks for your question! Let's see if your peers in the community have an answer to your question. Thanks.

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kishorekumar
by • New Contributor
  • 2756 Views
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Silent failure in DataFrameWriter when loading data to Redshift

Context:I'm using DataFrameWriter to load the dataSet into the Redshift. DataFrameWriter writes the dataSet to S3, and loads data from S3 to Redshift by issuing the Redshift copy command. Issue:In frequently we are observing, the data is present in t...

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Anonymous
Not applicable
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Hi @Kishorekumar Somasundaram​ Great to meet you, and thanks for your question! Let's see if your peers in the community have an answer to your question. Thanks.

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Data_Analytics1
by • Contributor III
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Getting JsonParseException: Unexpected character ('<' (code 60))

I have a scheduled job that is executed using a notebook. Within one of the notebook cells, there is a check to determine if a table exists. However, even when the table does exist, it incorrectly identifies it as non-existent and proceeds to execut...

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Anonymous
Not applicable
  • 0 kudos

Hi @Mahesh Chahare​ Great to meet you, and thanks for your question! Let's see if your peers in the community have an answer to your question. Thanks.

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teng_shin_lim
by • New Contributor
  • 3485 Views
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Having issue trying to download a csv file from a website using FireFox Selenium.

Hi, When I clicked on the download button from a website thru Firefox selenium using element.click(), and the download destination is being set as Azure datalake storage. Then, after the download started, those .csv and .csv.part files never gotten m...

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Anonymous
Not applicable
  • 1 kudos

Hi @Brandon Lim​ Great to meet you, and thanks for your question! Let's see if your peers in the community have an answer to your question. Thanks.

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THIAM_HUATTAN
by • Valued Contributor
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Parquet column cannot be converted. Column: [Rainfall_Value], Expected: DoubleType, Found: INT64

df.printSchema()root |-- Device_ID: string (nullable = true) |-- Location: string (nullable = true) |-- Latitude: double (nullable = true) |-- Longitude: double (nullable = true) |-- DateTime: timestamp (nullable = true) |-- Rainfall_Value: double (n...

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Lakshay
Databricks Employee
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Hi @THIAM HUAT TAN​ , The issue is because the schema defined for the column "Rainfall_Value" is of DoubleType and the values present in the data frame are of Integer type. This could be because of one or multiple values. Depending on the data, you ...

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charlieyou
by • New Contributor
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StreamingQueryException: Read timed out // Reading from delta share'd dataset

I have a workspace in GCP that's reading from a delta-shared dataset hosted in S3. When trying to run a very basic DLT pipeline, I'm getting the below error. Any help would be awesome!Code:import dlt     @dlt.table def fn(): return (spark.readStr...

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Anonymous
Not applicable
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@Charlie You​ :The error message you're encountering suggests a timeout issue when reading from the Delta-shared dataset hosted in S3. There are a few potential reasons and solutions you can explore:Network connectivity: Verify that the network conne...

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shubhadip
by • New Contributor
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If we do z-order on a particular column will delta log stats collection be affected?

Let's assume a table contains more than 40 columns, now we know it automatically collects stat for the first 32 columns. If we run a z-order on a particular column(let's say column 1), then will the log file collect stats for all the 32 columns or wi...

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Anonymous
Not applicable
  • 0 kudos

@Shubhadip Ghosh​ : Hope this helps. In Delta Lake, when you perform Z-Ordering on a particular column, it reorganizes the data within the files based on the values of that column. However, Z-Ordering itself does not directly affect the statistics co...

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shubhadip
by • New Contributor
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Will consecutive delete insert affect z-ordering?

Let's say there is a delta table with a date field as its partition. In a table where condition, we delete all the rows according to the division. The data is currently being inserted into the same date field. If we do a z-order after inserting the d...

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Anonymous
Not applicable
  • 0 kudos

@Shubhadip Ghosh​ :In Delta Lake, when you perform a delete operation on a table, it doesn't physically remove the data from the files. Instead, it marks the affected rows for deletion by adding a tombstone marker to the Delta transaction log. This e...

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