Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/3518#discussion_r21786744
--- Diff: docs/configuration.md ---
@@ -517,6 +517,14 @@ Apart from these, the following properties are also
available, and may be useful
</td>
</tr>
<tr>
+ <td><code>spark.serializer.debug</code></td>
+ <td>false</td>
+ <td>
+ To view the dependency graph for an RDD or the file dependencies for
task set this option
+ to true. Doing so will display a text based graph of these
dependencies along with a
+ serialization trace that identifies which components of an RDD failed
to serialize.
--- End diff --
Is this true? The original error message tells me the class of the object
that failed to serialize. This comment suggests that this trace tells me
something like which _instance_ that caused the error, but unless I'm mistaken
I don't think this patch actually does that.
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