Do you have a code sample, and detailed error message/exception to show? From: Martin Engen <martin.en...@outlook.com> Date: Tuesday, May 15, 2018 at 9:24 AM To: "user@spark.apache.org" <user@spark.apache.org> Subject: Structured Streaming, Reading and Updating a variable
Hello, I'm working with Structured Streaming, and I need a method of keeping a running average based on last 24hours of data. To help with this, I can use Exponential Smoothing, which means I really only need to store 1 value from a previous calculation into the new, and update this variable as calculations carry on. Implementing this is a much bigger challenge then I ever imagined. I've tried using Accumulators and to Query/Store data to Cassandra after every calculation. Both methods worked somewhat locally , but I don't seem to be able to use these in the Spark Worker Nodes, as I get the error "java.lang.NoClassDefFoundError: Could not initialize class error" both for the accumulator and the cassandra connection libary How can you read/update a variable while doing calculations using Structured Streaming? Thank you ________________________________________________________ The information contained in this e-mail is confidential and/or proprietary to Capital One and/or its affiliates and may only be used solely in performance of work or services for Capital One. The information transmitted herewith is intended only for use by the individual or entity to which it is addressed. If the reader of this message is not the intended recipient, you are hereby notified that any review, retransmission, dissemination, distribution, copying or other use of, or taking of any action in reliance upon this information is strictly prohibited. If you have received this communication in error, please contact the sender and delete the material from your computer.
