[ 
https://issues.apache.org/jira/browse/BEAM-8137?focusedWorklogId=607971&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-607971
 ]

ASF GitHub Bot logged work on BEAM-8137:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 07/Jun/21 16:21
            Start Date: 07/Jun/21 16:21
    Worklog Time Spent: 10m 
      Work Description: tweise commented on a change in pull request #14942:
URL: https://github.com/apache/beam/pull/14942#discussion_r646747491



##########
File path: 
runners/portability/java/src/main/java/org/apache/beam/runners/portability/ExternalWorkerService.java
##########
@@ -90,10 +97,44 @@ 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;
   }
+
+  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");
+    System.out.format("Pipeline options %s%n", 
environmentVarGetter.apply(PIPELINE_OPTIONS));
+    PipelineOptions options =
+        
PipelineOptionsTranslation.fromJson(environmentVarGetter.apply(PIPELINE_OPTIONS));
+
+    try (GrpcFnServer<ExternalWorkerService> server = new 
ExternalWorkerService(options).start()) {
+      System.out.format(
+          "External worker service started at address: %s",
+          server.getApiServiceDescriptor().getUrl());
+      while (true) {
+        Sleeper.DEFAULT.sleep(60 * 60 * 24 * 1000);

Review comment:
       Document why we wait/sleep here.

##########
File path: 
runners/portability/java/src/main/java/org/apache/beam/runners/portability/ExternalWorkerService.java
##########
@@ -90,10 +97,44 @@ 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;
   }
+
+  public static void main(String[] args) throws Exception {

Review comment:
       Perhaps documentation with an example how to start the worker pool would 
be useful?




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 607971)
    Time Spent: 1h 40m  (was: 1.5h)

> Worker pool option for Java SDK container
> -----------------------------------------
>
>                 Key: BEAM-8137
>                 URL: https://issues.apache.org/jira/browse/BEAM-8137
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-java-harness
>            Reporter: Thomas Weise
>            Priority: P3
>              Labels: Clarified
>          Time Spent: 1h 40m
>  Remaining Estimate: 0h
>
> The worker pool option was added to the Python SDK container in BEAM-7980. 
> Support in the Java SDK container is simpler since it can rely on threading 
> and it should be added for feature parity.



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