wbo4958 opened a new pull request, #50475:
URL: https://github.com/apache/spark/pull/50475
### What changes were proposed in this pull request?
This PR is to construct the session-specific classloader based on the
default session classloader which has already added the global jars (e.g.,
added by `--jars` ) into the classpath on the executor side in the connect mode.
### Why are the changes needed?
In Spark Connect mode, when connecting to a non-local (e.g., standalone)
cluster, the executor creates an isolated session state that includes a
session-specific classloader for each task. However, a notable issue arises:
this session-specific classloader does not include the global JARs specified by
the --jars option in the classpath. This oversight can lead to deserialization
exceptions. For example:
``` console
Caused by: java.lang.ClassCastException: cannot assign instance of
java.lang.invoke.SerializedLambda to field
org.apache.spark.rdd.MapPartitionsRDD.f of type scala.Function3 in instance of
org.apache.spark.rdd.MapPartitionsRDD
at
java.io.ObjectStreamClass$FieldReflector.setObjFieldValues(ObjectStreamClass.java:2096)
```
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
The newly added test can pass.
### Was this patch authored or co-authored using generative AI tooling?
No
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