HADOOP-18647. x-ms-client-request-id to identify the retry of an API. (#5437)

The x-ms-client-request-id now includes a field to indicate a call is a retry of a previous
operation

Contributed by Pranav Saxena

hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/utils/TracingContext.java

@@ -63,6 +63,16 @@ public class TracingContext {
   //final concatenated ID list set into x-ms-client-request-id header
   private String header = EMPTY_STRING;
 
+  /**
+   * If {@link #primaryRequestId} is null, this field shall be set equal
+   * to the last part of the {@link #clientRequestId}'s UUID
+   * in {@link #constructHeader(AbfsHttpOperation, String)} only on the
+   * first API call for an operation. Subsequent retries for that operation
+   * will not change this field. In case {@link  #primaryRequestId} is non-null,
+   * this field shall not be set.
+   */
+  private String primaryRequestIdForRetry;
+
   private static final Logger LOG = LoggerFactory.getLogger(AbfsClient.class);
   public static final int MAX_CLIENT_CORRELATION_ID_LENGTH = 72;
   public static final String CLIENT_CORRELATION_ID_PATTERN = "[a-zA-Z0-9-]*";
@@ -152,8 +162,8 @@ public class TracingContext {
    * X_MS_CLIENT_REQUEST_ID header of the http operation
    * @param httpOperation AbfsHttpOperation instance to set header into
    *                      connection
-   * @param previousFailure List of failures seen before this API trigger on
-   * same operation from AbfsClient.
+   * @param previousFailure Failure seen before this API trigger on same operation
+   * from AbfsClient.
    */
   public void constructHeader(AbfsHttpOperation httpOperation, String previousFailure) {
     clientRequestId = UUID.randomUUID().toString();
@@ -161,8 +171,8 @@ public class TracingContext {
     case ALL_ID_FORMAT: // Optional IDs (e.g. streamId) may be empty
       header =
           clientCorrelationID + ":" + clientRequestId + ":" + fileSystemID + ":"
-              + primaryRequestId + ":" + streamID + ":" + opType + ":"
-              + retryCount;
+              + getPrimaryRequestIdForHeader(retryCount > 0) + ":" + streamID
+              + ":" + opType + ":" + retryCount;
       header = addFailureReasons(header, previousFailure);
       break;
     case TWO_ID_FORMAT:
@@ -175,6 +185,31 @@ public class TracingContext {
       listener.callTracingHeaderValidator(header, format);
     }
     httpOperation.setRequestProperty(HttpHeaderConfigurations.X_MS_CLIENT_REQUEST_ID, header);
+    /*
+    * In case the primaryRequestId is an empty-string and if it is the first try to
+    * API call (previousFailure shall be null), maintain the last part of clientRequestId's
+    * UUID in primaryRequestIdForRetry. This field shall be used as primaryRequestId part
+    * of the x-ms-client-request-id header in case of retry of the same API-request.
+    */
+    if (primaryRequestId.isEmpty() && previousFailure == null) {
+      String[] clientRequestIdParts = clientRequestId.split("-");
+      primaryRequestIdForRetry = clientRequestIdParts[
+          clientRequestIdParts.length - 1];
+    }
+  }
+
+  /**
+   * Provide value to be used as primaryRequestId part of x-ms-client-request-id header.
+   * @param isRetry define if it's for a retry case.
+   * @return {@link #primaryRequestIdForRetry}:If the {@link #primaryRequestId}
+   * is an empty-string, and it's a retry iteration.
+   * {@link #primaryRequestId} for other cases.
+   */
+  private String getPrimaryRequestIdForHeader(final Boolean isRetry) {
+    if (!primaryRequestId.isEmpty() || !isRetry) {
+      return primaryRequestId;
+    }
+    return primaryRequestIdForRetry;
   }
 
   private String addFailureReasons(final String header,

hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azurebfs/TestTracingContext.java

@@ -31,12 +31,14 @@ import org.junit.Assume;
 import org.junit.AssumptionViolatedException;
 import org.junit.Ignore;
 import org.junit.Test;
+import org.mockito.Mockito;
 
 import org.apache.hadoop.fs.CommonPathCapabilities;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.azurebfs.constants.AbfsHttpConstants;
 import org.apache.hadoop.fs.azurebfs.constants.FSOperationType;
 import org.apache.hadoop.fs.azurebfs.enums.Trilean;
+import org.apache.hadoop.fs.azurebfs.services.AbfsHttpOperation;
 import org.apache.hadoop.fs.azurebfs.services.AbfsRestOperation;
 import org.apache.hadoop.fs.azurebfs.services.AuthType;
 import org.apache.hadoop.fs.azurebfs.utils.TracingContext;
@@ -198,4 +200,74 @@ public class TestTracingContext extends AbstractAbfsIntegrationTest {
     fs.getAbfsStore().setNamespaceEnabled(Trilean.TRUE);
     fs.access(new Path("/"), FsAction.READ);
   }
+
+  @Test
+  public void testRetryPrimaryRequestIdWhenInitiallySuppliedEmpty() throws Exception {
+    final AzureBlobFileSystem fs = getFileSystem();
+    final String fileSystemId = fs.getFileSystemId();
+    final String clientCorrelationId = fs.getClientCorrelationId();
+    final TracingHeaderFormat tracingHeaderFormat = TracingHeaderFormat.ALL_ID_FORMAT;
+    TracingContext tracingContext = new TracingContext(clientCorrelationId,
+        fileSystemId, FSOperationType.CREATE_FILESYSTEM, tracingHeaderFormat, new TracingHeaderValidator(
+        fs.getAbfsStore().getAbfsConfiguration().getClientCorrelationId(),
+        fs.getFileSystemId(), FSOperationType.CREATE_FILESYSTEM, false,
+        0));
+    AbfsHttpOperation abfsHttpOperation = Mockito.mock(AbfsHttpOperation.class);
+    Mockito.doNothing().when(abfsHttpOperation).setRequestProperty(Mockito.anyString(), Mockito.anyString());
+    tracingContext.constructHeader(abfsHttpOperation, null);
+    String header = tracingContext.getHeader();
+    String clientRequestIdUsed = header.split(":")[1];
+    String[] clientRequestIdUsedParts = clientRequestIdUsed.split("-");
+    String assertionPrimaryId = clientRequestIdUsedParts[clientRequestIdUsedParts.length - 1];
+
+    tracingContext.setRetryCount(1);
+    tracingContext.setListener(new TracingHeaderValidator(
+        fs.getAbfsStore().getAbfsConfiguration().getClientCorrelationId(),
+        fs.getFileSystemId(), FSOperationType.CREATE_FILESYSTEM, false,
+        1));
+
+    tracingContext.constructHeader(abfsHttpOperation, "RT");
+    header = tracingContext.getHeader();
+    String primaryRequestId = header.split(":")[3];
+
+    Assertions.assertThat(primaryRequestId)
+        .describedAs("PrimaryRequestId in a retried request's "
+            + "tracingContext should be equal to last part of original "
+            + "request's clientRequestId UUID")
+        .isEqualTo(assertionPrimaryId);
+  }
+
+  @Test
+  public void testRetryPrimaryRequestIdWhenInitiallySuppliedNonEmpty() throws Exception {
+    final AzureBlobFileSystem fs = getFileSystem();
+    final String fileSystemId = fs.getFileSystemId();
+    final String clientCorrelationId = fs.getClientCorrelationId();
+    final TracingHeaderFormat tracingHeaderFormat = TracingHeaderFormat.ALL_ID_FORMAT;
+    TracingContext tracingContext = new TracingContext(clientCorrelationId,
+        fileSystemId, FSOperationType.CREATE_FILESYSTEM, tracingHeaderFormat, new TracingHeaderValidator(
+        fs.getAbfsStore().getAbfsConfiguration().getClientCorrelationId(),
+        fs.getFileSystemId(), FSOperationType.CREATE_FILESYSTEM, false,
+        0));
+    tracingContext.setPrimaryRequestID();
+    AbfsHttpOperation abfsHttpOperation = Mockito.mock(AbfsHttpOperation.class);
+    Mockito.doNothing().when(abfsHttpOperation).setRequestProperty(Mockito.anyString(), Mockito.anyString());
+    tracingContext.constructHeader(abfsHttpOperation, null);
+    String header = tracingContext.getHeader();
+    String assertionPrimaryId = header.split(":")[3];
+
+    tracingContext.setRetryCount(1);
+    tracingContext.setListener(new TracingHeaderValidator(
+        fs.getAbfsStore().getAbfsConfiguration().getClientCorrelationId(),
+        fs.getFileSystemId(), FSOperationType.CREATE_FILESYSTEM, false,
+        1));
+
+    tracingContext.constructHeader(abfsHttpOperation, "RT");
+    header = tracingContext.getHeader();
+    String primaryRequestId = header.split(":")[3];
+
+    Assertions.assertThat(primaryRequestId)
+        .describedAs("PrimaryRequestId in a retried request's tracingContext "
+            + "should be equal to PrimaryRequestId in the original request.")
+        .isEqualTo(assertionPrimaryId);
+  }
 }

hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azurebfs/utils/TracingHeaderValidator.java

@@ -130,6 +130,9 @@ public class TracingHeaderValidator implements Listener {
     }
     Assertions.assertThat(idList[5]).describedAs("Operation name incorrect")
         .isEqualTo(operation.toString());
+    if (idList[6].contains("_")) {
+      idList[6] = idList[6].split("_")[0];
+    }
     int retryCount = Integer.parseInt(idList[6]);
     Assertions.assertThat(retryCount)
         .describedAs("Retry was required due to issue on server side")