Forum Discussion
Dataflow gen2 refresh Error
Hi smpa01
Mashup error code 10855 is defined as
Mashup Table: Appears to be an empty table with defined columns but no data.
Ensure your query returns at least one row by adding something like
if Table.IsEmpty(Source) then ... else ...
It would also be helpful if you paste the query into power BI so you can go through each transformation to identify the exact point the flow fails.
Thanks for this. This table has incremental refresh baked in which might result in a an empty table. i am not sure how that needs to be handled for lakehouse ingestion.
This part should be internally baked in to incemental refresh -
if Table.IsEmpty(Source) then ... else ...miguel can you please provide some insights on to why df gen2 keeps on faikling for some tables from on prem sql db. I keep on getting this, I am trying to ingest a base table without incremental refresh and it is still failing
I'm not sure sure that we can help with the information shared on this thread. Do you have a way for us to repro the behavior or could you go into details as to how we could create something similar in our own environments ? Or perhaps a more detailed definition of your mashup document ?
assuming that you're using the latest version of the gateway, please raise a support ticket so our engineering team can take a closer look at this scenario
To reproduce
#1. Ingest a data from on prem sql server to a lakehouse with fixed schema and replace using a df gen2. Do not factor in incremental refresh.
There is no issue in this step.
#2. Go back and factor in incremental refresh in the same df gen2 and run the dataflow. It errors out in this stage with 10855.
#3. If you factor in incremental refresh in #1 before doing a base ingestion, it gets error out with tge same error.
What I desire is to be able to ingest from on prem sql server db to lakehouse with incremental baked in without any error.
I keep getting the same error too when trying to setup a Dataflow Gen2 with Incremental Refresh and a Lakehouse as destination.
I followed the guides from Microsoft, including making sure that the lakehouse table uses a Fixed schema and that the query fully folds. I've done multiple attempts but I keep getting the error:
Apply_Activities_Incremental_Over_Periods: There was a problem refreshing the dataflow: 'Couldn't refresh the entity because of an issue with the mashup document MashupException.Error: The value does not support versioning. Details: Reason = Expression.Error;ErrorCode = 10855;
