Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/1792#discussion_r15840899
--- Diff: core/src/main/scala/org/apache/spark/rdd/JdbcRDD.scala ---
@@ -70,20 +70,30 @@ class JdbcRDD[T: ClassTag](
override def compute(thePart: Partition, context: TaskContext) = new
NextIterator[T] {
context.addOnCompleteCallback{ () => closeIfNeeded() }
val part = thePart.asInstanceOf[JdbcPartition]
- val conn = getConnection()
- val stmt = conn.prepareStatement(sql, ResultSet.TYPE_FORWARD_ONLY,
ResultSet.CONCUR_READ_ONLY)
+ var conn : Connection = _
+ var stmt : PreparedStatement = _
+ try {
--- End diff --
Actually as I look at this again, I think the try is not necessary.
Basically the first line in the constructor adds "closeIfNeeded" callback to
the complete callback list. Then if any exception is thrown, even during the
constructor, I think closeIfNeeded is called to close connections.
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