[SPARK-12056][CORE] Part 2 Create a TaskAttemptContext only after calling setConf

Author: tedyu

sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/SqlNewHadoopRDD.scala

@@ -148,14 +148,14 @@ private[spark] class SqlNewHadoopRDD[V: ClassTag](
       }
       inputMetrics.setBytesReadCallback(bytesReadCallback)
 
-      val attemptId = newTaskAttemptID(jobTrackerId, id, isMap = true, split.index, 0)
-      val hadoopAttemptContext = newTaskAttemptContext(conf, attemptId)
       val format = inputFormatClass.newInstance
       format match {
         case configurable: Configurable =>
           configurable.setConf(conf)
         case _ =>
       }
+      val attemptId = newTaskAttemptID(jobTrackerId, id, isMap = true, split.index, 0)
+      val hadoopAttemptContext = newTaskAttemptContext(conf, attemptId)
       private[this] var reader: RecordReader[Void, V] = null
 
       /**