Revert "adding detailed stack"

This reverts commit 1557dab.

Author: sahusanket

cdap-storage-ext-spanner/src/main/java/io/cdap/cdap/storage/spanner/SpannerStructuredTable.java

@@ -101,41 +101,16 @@ public SpannerStructuredTable(TransactionContext transactionContext,
    */
   private String getCaller() {
     StackTraceElement[] elements = Thread.currentThread().getStackTrace();
-    StringBuilder callerPath = new StringBuilder();
-    int depth = 0;
-
+    // Index 0 is getStackTrace, Index 1 is getCaller, so start at 2
     for (int i = 2; i < elements.length; i++) {
       String className = elements[i].getClassName();
-
-      // Skip Spanner storage classes, base Java internals, and Netty web server internals
+      // Skip Spanner storage classes and native Thread calls to find the actual CDAP caller
       if (!className.startsWith("io.cdap.cdap.storage.spanner") &&
-          !className.startsWith("java.") &&
-          !className.startsWith("javax.") &&
-          !className.startsWith("sun.") &&
-          !className.startsWith("jdk.") &&
-          !className.startsWith("io.netty.")) {
-
-        // Strip the long package name for readability (e.g., just "AppMetadataStore")
-        String simpleClassName = className.substring(className.lastIndexOf('.') + 1);
-
-        if (callerPath.length() > 0) {
-          callerPath.append(" <- ");
-        }
-
-        callerPath.append(simpleClassName)
-            .append(".")
-            .append(elements[i].getMethodName())
-            .append(":")
-            .append(elements[i].getLineNumber());
-
-        depth++;
-        // Capture up to 4 levels deep. This is usually enough to hit the HttpHandler
-        if (depth >= 4) {
-          break;
-        }
+          !className.startsWith("java.lang.Thread")) {
+        return className + "." + elements[i].getMethodName() + ":" + elements[i].getLineNumber();
       }
     }
-    return callerPath.length() > 0 ? callerPath.toString() : "UnknownCaller";
+    return "UnknownCaller";
   }
 
   @Override