# Steps cannot run with Spark on AEL The following **Flow** category transformation steps do not run with Spark on AEL. When you include one of these steps in a transformation or job with Spark on AEL, the KTR or KJB may fail to execute without logging an error. * Annotate stream * Append streams * Java filter * Job executor * Prioritize streams * Shared dimension * Single threader To avoid this issue, do not use these orchestration steps with Spark on AEL. If you need to organize the flow of your PDI transformations with Spark, the best practice is to use the Pentaho Server to orchestrate the KTRs using a Pentaho engine job. See the **Pentaho Data Integration** document for details on PDI transformations, jobs, steps, and entries. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.pentaho.com/install/9.3-install/pentaho-configuration/tasks-to-be-performed-by-an-it-administrator/set-up-the-adaptive-execution-layer-ael/troubleshooting-ael-cp/steps-cannot-run-with-spark-on-ael.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.