Prabhu Joseph created SPARK-48517:
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Summary: PythonWorkerFactory does not print error stream in case
the daemon fails before the main daemon.py#method
Key: SPARK-48517
URL: https://issues.apache.org/jira/browse/SPARK-48517
Project: Spark
Issue Type: Bug
Components: PySpark
Affects Versions: 3.3.2
Reporter: Prabhu Joseph
PythonWorkerFactory does not print the error stream in case the daemon fails
before calling the main daemon.py#method.
It throws SparkException like below but does not print the error stream which
has the failure why pyspark.daemon failed to start.
{code:java}
org.apache.spark.SparkException:
2024-05-07T16:04:53.169524256Z stderr F Bad data in pyspark.daemon's standard
output. Invalid port number:
2024-05-07T16:04:53.169530703Z stderr F 1097887852 (0x4170706c){code}
The error stream is being
[read|[https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/api/python/PythonWorkerFactory.scala#L303]]
after throwing SparkException. It has to be captured during the exception as
well.
*Simple Repro:*
1. Run a sample pyspark job by setting wrong
spark.python.daemon.module like pyspark.wrongdaemon instead of default one
pyspark.daemon.
2. The forked python process will fail with
{*}"{*}{*}/opt/python/3.9.2/bin/python: No module named pyspark.wrongdaemon"{*}
but it is not captured by PythonWorkerFactory.
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