Github user jerryshao commented on a diff in the pull request:
https://github.com/apache/spark/pull/10320#discussion_r47741408
--- Diff: core/src/main/scala/org/apache/spark/rdd/JdbcRDD.scala ---
@@ -100,6 +101,7 @@ class JdbcRDD[T: ClassTag](
}
override def close() {
+ if (closed) return
try {
if (null != rs) {
rs.close()
--- End diff --
From my understanding, we could call `rs = null` after it is closed, also
for `stmt` and `conn` in the same way to make this function is reenterable.
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