anujmodi2021 commented on code in PR #7837:
URL: https://github.com/apache/hadoop/pull/7837#discussion_r2250351858


##########
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/utils/TracingHeaderVersion.java:
##########
@@ -0,0 +1,50 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.fs.azurebfs.utils;
+
+public enum TracingHeaderVersion {
+
+  V0("", 8),
+  V1("v1", 13);
+
+  private final String version;
+  private final int fieldCount;
+
+  TracingHeaderVersion(String version, int fieldCount) {
+    this.version = version;
+    this.fieldCount = fieldCount;
+  }
+
+  @Override
+  public String toString() {
+    return version;
+  }
+
+  public static TracingHeaderVersion getCurrentVersion() {
+    return V1;

Review Comment:
   We need to update it to the latest version every time we do a version 
upgrade.



##########
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/utils/TracingContext.java:
##########
@@ -193,32 +213,33 @@ public void setListener(Listener listener) {
   public void constructHeader(AbfsHttpOperation httpOperation, String 
previousFailure, String retryPolicyAbbreviation) {
     clientRequestId = UUID.randomUUID().toString();
     switch (format) {
-    case ALL_ID_FORMAT: // Optional IDs (e.g. streamId) may be empty
-      header =
-          clientCorrelationID + ":" + clientRequestId + ":" + fileSystemID + 
":"
-              + getPrimaryRequestIdForHeader(retryCount > 0) + ":" + streamID
-              + ":" + opType + ":" + retryCount;
-      header = addFailureReasons(header, previousFailure, 
retryPolicyAbbreviation);
-      if (!(ingressHandler.equals(EMPTY_STRING))) {
-        header += ":" + ingressHandler;
-      }
-      if (!(position.equals(EMPTY_STRING))) {
-        header += ":" + position;
-      }
-      if (operatedBlobCount != null) {
-        header += (":" + operatedBlobCount);
-      }
-      header += (":" + httpOperation.getTracingContextSuffix());
-      metricHeader += !(metricResults.trim().isEmpty()) ? metricResults  : "";
+    case ALL_ID_FORMAT:
+      header = TracingHeaderVersion.V1.getVersion() + COLON

Review Comment:
   Fixed



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