HDFS-15044. [Dynamometer] Show the line of audit log when parsing it unsuccessfully. (#1749)

hadoop-tools/hadoop-dynamometer/hadoop-dynamometer-workload/src/main/java/org/apache/hadoop/tools/dynamometer/workloadgenerator/audit/AuditLogDirectParser.java

@@ -125,8 +125,9 @@ public class AuditLogDirectParser implements AuditCommandParser {
       relativeTimestamp = dateFormat.parse(m.group("timestamp")).getTime()
           - startTimestamp;
     } catch (ParseException p) {
-      throw new IOException("Exception while parsing timestamp from audit log",
-          p);
+      throw new IOException(
+          "Exception while parsing timestamp from audit log line: `"
+          + inputLine + "`", p);
     }
     // Sanitize the = in the rename options field into a : so we can split on =
     String auditMessageSanitized =
@@ -141,7 +142,8 @@ public class AuditLogDirectParser implements AuditCommandParser {
         parameterMap.put(splitMessage[0], splitMessage[1]);
       } catch (ArrayIndexOutOfBoundsException e) {
         throw new IOException(
-            "Exception while parsing a message from audit log", e);
+            "Exception while parsing a message from audit log line: `"
+            + inputLine + "`", e);
       }
     }