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https://issues.apache.org/jira/browse/HADOOP-18382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17576941#comment-17576941
 ] 

ASF GitHub Bot commented on HADOOP-18382:
-----------------------------------------

steveloughran commented on code in PR #4698:
URL: https://github.com/apache/hadoop/pull/4698#discussion_r940562613


##########
hadoop-tools/hadoop-aws/src/site/markdown/tools/hadoop-aws/aws_sdk_upgrade.md:
##########
@@ -0,0 +1,76 @@
+<!---
+  Licensed 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. See accompanying LICENSE file.
+-->
+
+# Upgrading S3A to AWS SDK V2
+
+This document explains the upcoming work for upgrading S3A to AWS SDK V2.
+This work is tracked in 
[HADOOP-18073](https://issues.apache.org/jira/browse/HADOOP-18073).
+
+## Why do we want to upgrade?

Review Comment:
   prefer "why the upgrade"



##########
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AFileSystem.java:
##########
@@ -849,6 +849,10 @@ private void bindAWSClient(URI name, boolean dtEnabled) 
throws IOException {
       // with it if so.
 
       LOG.debug("Using delegation tokens");
+      LOG.warn(

Review Comment:
   you need to use a LogOnce; we should consider having a special log just for 
v2 warnings, so people can turn it off entirely (i would for example)



##########
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AUtils.java:
##########
@@ -637,6 +637,11 @@ public static AWSCredentialProviderList 
buildAWSProviderList(
     AWSCredentialProviderList providers = new AWSCredentialProviderList();
     for (Class<?> aClass : awsClasses) {
 
+      if (aClass.getName().contains(AWS_AUTH_CLASS_PREFIX)) {

Review Comment:
   again, log through the proposed LogOnce log





> Upgrade AWS SDK to V2 - Prerequisites 
> --------------------------------------
>
>                 Key: HADOOP-18382
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18382
>             Project: Hadoop Common
>          Issue Type: Sub-task
>            Reporter: Ahmar Suhail
>            Assignee: Ahmar Suhail
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> We want to update the AWS SDK to V2, before we do this we should warn on 
> things that will no longer supported. The following changes should be made:
>  
>  * 
> [getAmazonS3Client()|https://github.com/apache/hadoop/blob/221eb2d68d5b52e4394fd36cb30d5ee9ffeea7f0/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AFileSystem.java#L1174]
>  - Warn that this method will be removed 
>  * 
> [initCustomSigners()|https://github.com/apache/hadoop/blob/03cfc852791c14fad39db4e5b14104a276c08e59/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/auth/SignerManager.java#L65]
>  - Warn that the interface is changing, any custom signers will need to be 
> updated
>  * 
> [bindAWSClient|https://github.com/apache/hadoop/blob/trunk/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AFileSystem.java#L840]
>  - If DT is enabled, warn that credential providers interface is changing, 
> any custom cred providers used in binding classes will need to be updated
>  *  
> [buildAWSProviderList|https://github.com/apache/hadoop/blob/trunk/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AUtils.java#L618]
>  - if any SDK V1 cred providers are in this list, warn that these will be 
> removed
>  * 
> [S3ClientFactory|https://github.com/apache/hadoop/blob/221eb2d68d5b52e4394fd36cb30d5ee9ffeea7f0/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3ClientFactory.java]
>  - Update javadocs to say this interface will be replaced by a V2 client 
> factory, mark interface deprecated?



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