[ 
https://issues.apache.org/jira/browse/HADOOP-18910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17819483#comment-17819483
 ] 

ASF GitHub Bot commented on HADOOP-18910:
-----------------------------------------

anujmodi2021 commented on code in PR #6069:
URL: https://github.com/apache/hadoop/pull/6069#discussion_r1498704079


##########
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/contracts/exceptions/AbfsInvalidChecksumException.java:
##########
@@ -0,0 +1,56 @@
+/**
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.contracts.exceptions;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.fs.azurebfs.contracts.services.AzureServiceErrorCode;
+
+/**
+ * Exception to wrap invalid checksum verification on client side.
+ */
+@InterfaceAudience.Public
+@InterfaceStability.Evolving
+public class AbfsInvalidChecksumException extends AbfsRestOperationException {
+
+  private static final String ERROR_MESSAGE = "Checksum Validation Failed, MD5 
Mismatch Error";
+
+  public AbfsInvalidChecksumException(final AbfsRestOperationException 
abfsRestOperationException) {
+    super(
+        abfsRestOperationException != null
+            ? abfsRestOperationException.getStatusCode()
+            : AzureServiceErrorCode.UNKNOWN.getStatusCode(),
+        abfsRestOperationException != null
+            ? abfsRestOperationException.getErrorCode().getErrorCode()
+            : AzureServiceErrorCode.UNKNOWN.getErrorCode(),
+        abfsRestOperationException != null
+            ? abfsRestOperationException.toString()

Review Comment:
   toString() will be better it has more information like the URL which was hit.





> ABFS: Adding Support for MD5 Hash based integrity verification of the request 
> content during transport 
> -------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-18910
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18910
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/azure
>            Reporter: Anuj Modi
>            Assignee: Anuj Modi
>            Priority: Major
>              Labels: pull-request-available
>
> Azure Storage Supports Content-MD5 Request Headers in Both Read and Append 
> APIs.
> Read: [Path - Read - REST API (Azure Storage Services) | Microsoft 
> Learn|https://learn.microsoft.com/en-us/rest/api/storageservices/datalakestoragegen2/path/read]
> Append: [Path - Update - REST API (Azure Storage Services) | Microsoft 
> Learn|https://learn.microsoft.com/en-us/rest/api/storageservices/datalakestoragegen2/path/update]
> This change is to make client-side changes to support them. In Read request, 
> we will send the appropriate header in response to which server will return 
> the MD5 Hash of the data it sends back. On Client we will tally this with the 
> MD5 hash computed from the data received.
> In Append request, we will compute the MD5 Hash of the data that we are 
> sending to the server and specify that in appropriate header. Server on 
> finding that header will tally this with the MD5 hash it will compute on the 
> data received. 
> This whole Checksum Validation Support is guarded behind a config, Config is 
> by default disabled because with the use of "https" integrity of data is 
> preserved anyways. This is introduced as an additional data integrity check 
> which will have a performance impact as well.
> Users can decide if they want to enable this or not by setting the following 
> config to *"true"* or *"false"* respectively. *Config: 
> "fs.azure.enable.checksum.validation"*



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