kw2542 commented on a change in pull request #14942:
URL: https://github.com/apache/beam/pull/14942#discussion_r646945386
##########
File path:
runners/portability/java/src/main/java/org/apache/beam/runners/portability/ExternalWorkerService.java
##########
@@ -90,10 +97,55 @@ public void stopWorker(
public void close() {}
public GrpcFnServer<ExternalWorkerService> start() throws Exception {
- GrpcFnServer<ExternalWorkerService> server =
- GrpcFnServer.allocatePortAndCreateFor(this, serverFactory);
+ final String externalServiceAddress =
+
Environments.getExternalServiceAddress(options.as(PortablePipelineOptions.class));
+ GrpcFnServer<ExternalWorkerService> server;
+ if (externalServiceAddress.isEmpty()) {
+ server = GrpcFnServer.allocatePortAndCreateFor(this, serverFactory);
+ } else {
+ server =
+ GrpcFnServer.create(
+ this,
+
Endpoints.ApiServiceDescriptor.newBuilder().setUrl(externalServiceAddress).build(),
+ serverFactory);
+ }
LOG.debug(
"Listening for worker start requests at {}.",
server.getApiServiceDescriptor().getUrl());
return server;
}
+
+ /**
+ * Worker pool entry point.
+ *
+ * <p>The worker pool exposes an RPC service that is used with EXTERNAL
environment to start and
+ * stop the SDK workers.
+ *
+ * <p>The worker pool uses threads for parallelism;
+ *
+ * <p>This entry point is used by the Java SDK container in worker pool mode.
+ */
+ public static void main(String[] args) throws Exception {
+ main(System::getenv);
+ }
+
+ public static void main(Function<String, String> environmentVarGetter)
throws Exception {
+ System.out.format("Starting external worker service%n");
Review comment:
Good question, I don't really have any special reason but to be
consistent with `FnHarness#main`, any suggestion is welcome.
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