tvalentyn commented on a change in pull request #14607:
URL: https://github.com/apache/beam/pull/14607#discussion_r621553275



##########
File path: 
runners/google-cloud-dataflow-java/src/main/java/org/apache/beam/runners/dataflow/DataflowPipelineTranslator.java
##########
@@ -760,6 +776,24 @@ private void addDisplayData(Step step, String stepName, 
HasDisplayData hasDispla
       List<Map<String, Object>> list = MAPPER.convertValue(displayData, 
List.class);
       addList(getProperties(), PropertyNames.DISPLAY_DATA, list);
     }
+
+    private void addResourceHints(Step step, String stepName, ResourceHints 
hints) {
+      Map<String, Object> urlEncodedHints = new HashMap<>();
+      PercentCodec codec = new PercentCodec();
+      for (Entry<String, ResourceHint> entry : hints.hints().entrySet()) {
+        try {

Review comment:
       It doesn't seem to be new for Beam, 
https://github.com/apache/beam/blob/8b7f0b994926981298eb8195b2af24c8f12cebee/buildSrc/src/main/groovy/org/apache/beam/gradle/BeamModulePlugin.groovy#L500,
 but I had to declare it a compile-time dep for dataflow runner module. It is 
small (400kb jar) and unlikely cause versioning conflicts.
   One thought is that if we ever get to have binary-valued hints, encoding  
bytes directly will be easier. I notice though PercentCodec does not by default 
encode '+' as '%2b', but I can configure that to be safe. 




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