Caching Spark DataFrames/RDDs might speed up operations that need to access the same DataFrame/RDD several times e.g. when working with the same DataFrame/RDD within a loop body in a KNIME workflow.
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To use this node in KNIME, install the extension KNIME Extension for Apache Spark (legacy) from the below update site following our NodePit Product and Node Installation Guide:
A zipped version of the software site can be downloaded here.
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Please note that this is only about NodePit. We do not provide general support for KNIME — please use the KNIME forums instead.