Append data in existing file in U-SQL

感情迁移 提交于 2020-01-15 12:12:31

问题


Can we append data in existing file in U-SQL? I have created a CSV file as output in U-SQL. I am writing another U-SQL query and I want to append the output of that query in the existing file. Is it possible?


回答1:


It's not supported, and would go against the design of a robust, distributed, idempotent big data system (although you could implement that behaviour by reading the previous output as a rowset and do UNION ALL).

The best way to deal with this is to use partitions properly, for example, create one or more new partitions for each of your executions: https://msdn.microsoft.com/en-us/library/azure/mt621324.aspx



来源:https://stackoverflow.com/questions/40929858/append-data-in-existing-file-in-u-sql

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