Hyukjin Kwon created SPARK-61148:
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Summary: Leave a builder option of None unset, check the
destination of copyFromLocalToFs, and raise NO_ACTIVE_SESSION for the requests
of a stopped session, as PySpark does
Key: SPARK-61148
URL: https://issues.apache.org/jira/browse/SPARK-61148
Project: Spark
Issue Type: Bug
Components: Connect
Affects Versions: connect-rust-4.3.0
Reporter: Hyukjin Kwon
Three defects of the Python drop-in session, each differing from PySpark
Connect:
(1) SparkSession.builder.config(key, None) stores "" instead of leaving the key
unset, so spark.conf.get(key) returns '' where PySpark raises
SQL_CONF_NOT_FOUND.
(2) copyFromLocalToFs(local, "relative/out.txt") sends the request to the
server, where PySpark asserts "destination FS path must be an absolute path.";
the artifact name also had a double slash (forward_to_fs//tmp/x) where PySpark
uses forward_to_fs/tmp/x.
(3) After stop(), the session's requests (range().count(), sql, conf, version,
cloneSession) still run on the server, where PySpark's closed client raises
NO_ACTIVE_SESSION.
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