Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/19630 OK, mine was, with this diff: ```diff --- a/core/src/main/scala/org/apache/spark/api/python/PythonWorkerFactory.scala +++ b/core/src/main/scala/org/apache/spark/api/python/PythonWorkerFactory.scala @@ -38,7 +38,7 @@ private[spark] class PythonWorkerFactory(pythonExec: String, envVars: Map[String // (pyspark/daemon.py) and tell it to fork new workers for our tasks. This daemon currently // only works on UNIX-based systems now because it uses signals for child management, so we can // also fall back to launching workers (pyspark/worker.py) directly. - val useDaemon = !System.getProperty("os.name").startsWith("Windows") + val useDaemon = false var daemon: Process = null val daemonHost = InetAddress.getByAddress(Array(127, 0, 0, 1)) ``` ```bash pip install coverage # Build Spark (http://spark.apache.org/docs/latest/building-spark.html) rm python/lib/pyspark.zip rm -fr .coverage rm -fr coverage_html echo " #!/usr/bin/env bash coverage run -p \$@ " > coverage_python chmod 755 coverage_python PATH=`pwd`:$PATH PYSPARK_PYTHON=coverage_python SPARK_TESTING=1 bin/pyspark pyspark.sql.tests VectorizedUDFTests coverage combine coverage html -d coverage_html -i open coverage_html # Open up index.html in your browser. ```
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