#Tableau Prep32 discussing

I don't know if it is related or not but after updating to the most recent prep version I'm unable to publish from desktop to cloud. I tried downloading a few prep flows from cloud, turning around & republishing them and am running into the problem.

Uninstalling and reinstalling now to see if this fixes the problem.

[edit] that did not work

[edit] uninstalled 2024.2.2 and reinstalled 2024.2.1

[edit] With 2024.2.1 I was able to publish the test flow I had just downloaded from Online but still unable to publish the flow I needed

[edit] I found a workaround which was to publish as saved steps the entire flow absent the output. Once I had the steps open in Tableau Online I was able to add an output and publish without error.

For the last few days, I have been having issues with a flow that was working before. I need to publish it to the server after making some changes, but it repeatedly gives me a "Error publishing flow to Tableau Server." After some painstaking troubleshooting, I've narrowed the problem down to a deduplication step. If that step is there, it will not publish. If that step is NOT there, it publishes fine.  

This step is not a new part of the flow, it is also in the currently published version that has been running fine for months. 

Any suggestions? I do really need that deduplication step! 

Hi everyone,

I’m struggling to get Tableau Prep to recognize my TabPy server on macOS. Despite several attempts, Prep doesn't seem to establish a connection to the local server, and I’m hitting a wall.

I have been using the exact same Python scripts that work seamlessly on Windows. Even after updating the file paths and environment configurations to match the Mac file system, the connection fails. This leads me to believe it might be an issue specific to how Tableau Prep handles external service connections on macOS, rather than a script or tabpy error itself. 

#Tableau Prep

I am using Tableau Prep to manipulate data from .csv files and upload the data to a MySQL database. When reading the .csv files, Tableau Prep determines the data type of all columns automatically. However, for some columns of some tables, it determines the datatype incorrectly. I have investigated what is happening.

One of the tables has 7501 rows. In certain columns, the first 1335 of these rows contain just a 0. The 1336th row contains a decimal number, and other rows further down do as well. However, Tableau reads this column as a “whole number”. I now I can manually change the datatype of a column, but this does not not help me, since then I would need to manually configure the datatype Tableau Prep reads in for 250 columns for 29 .csv files I am reading (=7250 columns !!!). And even if I would actually do this all manually, the number of manual operations that I have then defined seems to be to much for Tableau Prep to handle (I have tried it for a single table, which was not successful, the flow never completed loading).

Is there a solution to make sure I am reading in all my data correctly? Or will I have to resort to resolutions outside of Tableau Prep? 

Hi Community, 

I’m currently facing an issue with my data refresh and would appreciate any guidance.

I’m unable to view the refreshed data from my Salesforce source, even though I have enabled refresh access in my Tableau Prep flow. There are no errors shown in the Jobs section on Tableau Cloud. However, when I check the Output step of my flow, I encounter the following error:

“Unable to run output step: Wait for cache write operation has terminated due to a failed write.”

For context, my flow currently outputs around 5 million rows, and the data volume is increasing daily rather than decreasing.

I have a couple of concerns:

•  What could be causing this cache write failure despite no visible job errors? 
•  If my output grows to 10 million rows (1 crore), will this impact my flow performance or dashboard reliability? 
•  Could increasing data volume prevent updated values from reflecting correctly in my dashboards in the future? 

Any insights or suggestions would be greatly appreciated. 

Thank you! 

Tableau Server上でパーミッションがついているのに、Prepでのデータソースパブリッシュが出来ません。

• ローカルでのPrep実行：パブリッシュ出来たり、出来なかったりします
• Server上でのPrep実行：毎回パブリッシュ出来ません

→いずれも「パーミッション不十分です」のエラーが出ます。    実行者のサイトロールはCreatorであり、パブリッシュ先のプロジェクトに十分はパーミッションがあることは確認しています。  ローカル実行で出来たり出来なかったりというのも謎です。原因としては何が考えられますか？   

When creating prep flows is there a way in the platform to create specific documentation of the steps that were performed to create the flow? We are in the process of creating documentation for all of our flows and was wondering if this is a feature in Prep or do we need to use ChatGPT or Gemini to create it? Thanks in advance. Vivian 

When I make a calculated field in Prep using a field with a type change, the data does not appear in the reulting datasource. For example, I had a Datetime field that showed the amount of time something took. I converted it to a string, then added the minutes and the hours (times 60) to get the total number of minutes the event took. Everything looks great in the flow. When I run the flow and open the datasource (or open a workbook based on the datasource), no data appears for that column. It's all Null. This has happened repeatedly recently, allways when I have converted the field type and made a calculation. Any suggestions? Is this happening for anyone else? 

All my data is highly confidential, so I cannot share it here.  

I keep getting the below error while running the flow to refresh the tables in SQL.    Something went wrong. Error: An error occurred while communicating with the data source An error occurred while communicating with the data source Invalid Query Fatal Error(1,1): invalid document structure (id: ) class DataSourceException. Try rerunning the flow.    It is running fine in tableau prep desktop and I am able to create/refresh it manually.