[ 
https://issues.apache.org/jira/browse/HADOOP-18562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17950595#comment-17950595
 ] 

ASF GitHub Bot commented on HADOOP-18562:
-----------------------------------------

steveloughran commented on code in PR #7379:
URL: https://github.com/apache/hadoop/pull/7379#discussion_r2082410937


##########
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/impl/AWSClientConfig.java:
##########
@@ -412,6 +419,36 @@ private static void initSigner(Configuration conf,
     }
   }
 
+  /**
+   * Initialize custom request headers for AWS clients.
+   * @param conf hadoop configuration
+   * @param clientConfig client configuration to update
+   * @param awsServiceIdentifier service name
+   */
+  private static void initRequestHeaders(Configuration conf,
+      ClientOverrideConfiguration.Builder clientConfig, String 
awsServiceIdentifier) {
+    String configKey = null;
+    switch (awsServiceIdentifier) {
+    case AWS_SERVICE_IDENTIFIER_S3:
+      configKey = CUSTOM_HEADERS_S3;
+      break;
+    case AWS_SERVICE_IDENTIFIER_STS:
+      configKey = CUSTOM_HEADERS_STS;
+      break;
+    default:
+      // No known service.
+    }
+    if (configKey != null) {
+      Map<String, String> awsClientCustomHeadersMap =
+              S3AUtils.getTrimmedStringCollectionSplitByEquals(conf, 
configKey);
+      awsClientCustomHeadersMap.forEach((header, valueString) -> {
+        List<String> headerValues = Arrays.asList(valueString.split(";"));

Review Comment:
   trim the header values of whitespace? or is there some risk that this could 
ever be needed?



##########
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/impl/TestAwsClientConfig.java:
##########
@@ -201,4 +208,64 @@ public void testCreateApiConnectionSettingsDefault() {
   private void setOptionsToValue(String value, Configuration conf, String... 
keys) {
     Arrays.stream(keys).forEach(key -> conf.set(key, value));
   }
+
+  /**
+   * if {@link org.apache.hadoop.fs.s3a.Constants#CUSTOM_HEADERS_STS} is set,
+   * verify that returned client configuration has desired headers set.
+   */
+  @Test
+  public void testInitRequestHeadersForSTS() throws IOException {
+    final Configuration conf = new Configuration();
+    conf.set(CUSTOM_HEADERS_STS, "foo=bar;baz,qux=quux");
+    Assertions.assertThat(conf.get(CUSTOM_HEADERS_S3))
+            .describedAs("Custom client headers for s3 %s", CUSTOM_HEADERS_S3)
+            .isNull();
+
+    Assertions.assertThat(createClientConfigBuilder(conf, 
AWS_SERVICE_IDENTIFIER_S3)
+            .headers().size())
+        .describedAs("Count of S3 client headers")
+        .isEqualTo(0);
+    Assertions.assertThat(createClientConfigBuilder(conf, 
AWS_SERVICE_IDENTIFIER_STS)
+            .headers().size())
+        .describedAs("Count of STS client headers")
+        .isEqualTo(2);
+    Assertions.assertThat(createClientConfigBuilder(conf, 
AWS_SERVICE_IDENTIFIER_STS)
+            .headers().get("foo"))
+        .describedAs("STS client 'foo' header value")
+        .isEqualTo(Lists.newArrayList("bar", "baz"));
+    Assertions.assertThat(createClientConfigBuilder(conf, 
AWS_SERVICE_IDENTIFIER_STS)
+            .headers().get("qux"))
+        .describedAs("STS client 'qux' header value")
+        .isEqualTo(Lists.newArrayList("quux"));
+  }
+
+  /**
+   * if {@link org.apache.hadoop.fs.s3a.Constants#CUSTOM_HEADERS_S3} is set,
+   * verify that returned client configuration has desired headers set.
+   */
+  @Test
+  public void testInitRequestHeadersForS3() throws IOException {
+    final Configuration conf = new Configuration();
+    conf.set(CUSTOM_HEADERS_S3, "foo=bar;baz,qux=quux");

Review Comment:
   repeat with a separate test adding spaces between all symbols, with 
assertions on the values. if we trim. it should be similar to this
   
   Add separate tests for 
   ```
   foo=,qux=quux
   foo=;,qux=quux;
   foo=;
   foo=,
   foo=;bar
   =
   foo=;;
   foo=duplicate;duplicate   // expect only one value
   foo=1,foo=2    // which one is picked up
   ```
   
   there's enough here to consider adding some common assert, e.g. 
   
   ```
   assertHeaderValues(string, List<string> header1_values, List<string> 
header_2_values) {
     // assert on each set of values
   }
   ```
   
   Also, let's cut foo/bar stuff.
   
   How about:
   
   "header1, header2", "value1, value2, value3"
   
   This will be good when debugging assertion failures.
   





> S3A: support custom S3 and STS headers
> --------------------------------------
>
>                 Key: HADOOP-18562
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18562
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Daniel Carl Jones
>            Assignee: Prerak Pradhan
>            Priority: Minor
>              Labels: pull-request-available
>
> Some users have the use case where for a particular S3A filesystem, they 
> would like to set one or more headers to a static value.
> We might imagine a set of configurations properties with a common prefix, 
> where the suffix determines the header name and the value of the property 
> determines the value of the header.
> Per-filesystem headers can be set using the per-bucket configuration.



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