anmolanmol1234 commented on code in PR #7837:
URL: https://github.com/apache/hadoop/pull/7837#discussion_r2250972747


##########
hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azurebfs/utils/TracingHeaderValidator.java:
##########
@@ -206,7 +207,7 @@ public void updateReadType(ReadType readType) {
   }
 
   /**
-   * Sets the value of the number of blobs operated on
+   * Sets the value of the number of blobs operated on976345

Review Comment:
   typo issue



##########
hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azurebfs/services/TestAbfsInputStream.java:
##########
@@ -886,40 +928,54 @@ private void 
testReadTypeInTracingContextHeaderInternal(AzureBlobFileSystem fs,
     ArgumentCaptor<ContextEncryptionAdapter> captor8 = 
ArgumentCaptor.forClass(ContextEncryptionAdapter.class);
     ArgumentCaptor<TracingContext> captor9 = 
ArgumentCaptor.forClass(TracingContext.class);
 
-    verify(fs.getAbfsStore().getClient(), times(numOfReadCalls)).read(
+    verify(fs.getAbfsStore().getClient(), times(totalReadCalls)).read(
         captor1.capture(), captor2.capture(), captor3.capture(),
         captor4.capture(), captor5.capture(), captor6.capture(),
         captor7.capture(), captor8.capture(), captor9.capture());
-    TracingContext tracingContext = captor9.getAllValues().get(numOfReadCalls 
- 1);
-    verifyHeaderForReadTypeInTracingContextHeader(tracingContext, readType);
+    List<TracingContext> tracingContextList = captor9.getAllValues();
+    if (readType == PREFETCH_READ) {
+      /*
+       * For Prefetch Enabled, first read can be Normal or Missed Cache Read.
+       * Sow e will assert only for last 2 calls which should be Prefetched 
Read.
+       * Since calls are asynchronous, we can not guarantee the order of calls.
+       * Therefore, we cannot assert on exact position here.
+       */
+      for (int i = tracingContextList.size() - (numOfReadCalls - 1); i < 
tracingContextList.size(); i++) {
+        
verifyHeaderForReadTypeInTracingContextHeader(tracingContextList.get(i), 
readType, -1);
+      }
+    } else if (readType == DIRECT_READ) {
+      int expectedReadPos = ONE_MB/3;

Review Comment:
   comment for why are we starting with this position will help in clarity



##########
hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azurebfs/services/TestApacheHttpClientFallback.java:
##########
@@ -61,15 +61,15 @@ private TracingContext getSampleTracingContext(int[] 
jdkCallsRegister,
           answer.callRealMethod();
           AbfsHttpOperation op = answer.getArgument(0);
           if (op instanceof AbfsAHCHttpOperation) {
-            Assertions.assertThat(tc.getHeader()).contains(APACHE_IMPL);
+            Assertions.assertThat(tc.getHeader()).endsWith(APACHE_IMPL);
             apacheCallsRegister[0]++;
           }
           if (op instanceof AbfsJdkHttpOperation) {
             jdkCallsRegister[0]++;
             if (AbfsApacheHttpClient.usable()) {
-              Assertions.assertThat(tc.getHeader()).contains(JDK_IMPL);
+              Assertions.assertThat(tc.getHeader()).endsWith(JDK_IMPL);

Review Comment:
   this might fail if we add new header where the network library is not 
maintained as the last header, so contains looks better to me



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