Made some minor style changes

core/src/main/scala/spark/Utils.scala

@@ -622,16 +622,15 @@ private object Utils extends Logging {
   }
 
   /** Return a string containing part of a file from byte 'a' to 'b'. */
-  def offsetBytes(path: String, a: Long, b: Long): String = {
+  def offsetBytes(path: String, start: Long, end: Long): String = {
     val file = new File(path)
     val length = file.length()
-    val B = math.min(length, b)
-    val A = math.max(0, a)
-    val buff = new Array[Byte]((B-A).toInt)
-    val skip = A
+    val effectiveStart = math.min(length, start)
+    val effectiveEnd = math.max(0, end)
+    val buff = new Array[Byte]((effectiveEnd-effectiveStart).toInt)
     val stream = new FileInputStream(file)
 
-    stream.skip(skip)
+    stream.skip(effectiveStart)
     stream.read(buff)
     stream.close()
     Source.fromBytes(buff).mkString

core/src/test/scala/spark/ui/UISuite.scala

@@ -91,13 +91,13 @@ class UISuite extends FunSuite {
     // Read last few bytes
     assert(Utils.offsetBytes(f1Path, 12, 18) === "7\n8\n9\n")
 
-    //Read some nonexistent bytes in the beginning
+    // Read some nonexistent bytes in the beginning
     assert(Utils.offsetBytes(f1Path, -5, 5) === "1\n2\n3")
 
-    //Read some nonexistent bytes at the end
+    // Read some nonexistent bytes at the end
     assert(Utils.offsetBytes(f1Path, 12, 22) === "7\n8\n9\n")
 
-    //Read some nonexistent bytes on both ends
+    // Read some nonexistent bytes on both ends
     assert(Utils.offsetBytes(f1Path, -3, 25) === "1\n2\n3\n4\n5\n6\n7\n8\n9\n")
 
     FileUtils.deleteDirectory(tmpDir2)