Abacn commented on code in PR #28783:
URL: https://github.com/apache/beam/pull/28783#discussion_r1353181001


##########
sdks/java/transform-service/src/main/java/org/apache/beam/sdk/transformservice/ExpansionService.java:
##########
@@ -48,10 +61,61 @@ public class ExpansionService extends 
ExpansionServiceGrpc.ExpansionServiceImplB
         clientFactory != null ? clientFactory : 
DEFAULT_EXPANSION_SERVICE_CLIENT_FACTORY;
   }
 
+  // Waits till all expansion services are ready.
+  private void waitForAllServicesToBeReady() throws TimeoutException {
+    if (disableServiceCheck) {
+      // Service check disabled. Just returning.
+      return;
+    }
+
+    outer:
+    for (Endpoints.ApiServiceDescriptor endpoint : endpoints) {
+      long start = System.currentTimeMillis();
+      long duration = 10;
+      while (System.currentTimeMillis() - start < SERVICE_CHECK_TIMEOUT) {
+        try {
+          String url = endpoint.getUrl();
+          int portIndex = url.lastIndexOf(":");
+          int port = portIndex > 0 ? Integer.parseInt(url.substring(portIndex 
+ 1)) : 80;

Review Comment:
   Changes LGTM. Have you been able to check this comment?



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