Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/11500#discussion_r55736339
--- Diff: yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala ---
@@ -423,7 +423,63 @@ private[spark] class Client(
}
/**
- * Copy the given main resource to the distributed cache if the scheme
is not "local".
+ * Add Spark to the cache. There are two settings that control what
files to add to the cache:
+ * - if a Spark archive is defined, use the archive. The archive is
expected to contain
+ * jar files at its root directory.
+ * - if a list of jars is provided, filter the non-local ones, resolve
globs, and
+ * add the found files to the cache.
+ *
+ * Note that the archive cannot be a "local" URI. If none of the above
settings are found,
+ * then upload all files found in $SPARK_HOME/jars.
+ *
+ * TODO: currently the code looks in $SPARK_HOME/lib while the work to
replace assemblies
--- End diff --
That's SPARK-13579. I'll have to fix all these when working on that one,
otherwise Spark won't work, so these are mostly reminders for myself that will
go away pretty soon.
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