Not loading csv files with ".c000.csv" in the name

jenshumrich
Contributor

Yesterday I created a ton of csv files via 

joined_df.write.partitionBy("PartitionColumn").mode("overwrite").csv(
            output_path, header=True
        )
Today, when working with them I realized, that they were not loaded. Upon investigation I saw that in the PartitionColumn folder are only a "_started_123" and a "par-00123-tic-123[.....].c000.csv" file. So no "_SUCCESS".
When renaming the csv files, they are correctly loaded. 
Now my question: What the heck is going on here? Was the writing process broken, and if so, why was this not logged? Why do the files have a ".c000.csv" ending? Why are they not loaded?