This closes #16

pom.xml

@@ -70,7 +70,7 @@
     <avro.version>1.7.7</avro.version>
     <bigquery.version>v2-rev248-1.21.0</bigquery.version>
     <bigtable.version>0.2.3</bigtable.version>
-    <dataflow.version>v1b3-rev19-1.21.0</dataflow.version>
+    <dataflow.version>v1b3-rev22-1.21.0</dataflow.version>
     <dataflow.proto.version>0.5.160222</dataflow.proto.version>
     <datastore.version>v1beta2-rev1-4.0.0</datastore.version>
     <google-clients.version>1.21.0</google-clients.version>

sdk/src/main/java/com/google/cloud/dataflow/sdk/options/DataflowPipelineWorkerPoolOptions.java

@@ -144,6 +144,18 @@ public String create(PipelineOptions options) {
   String getNetwork();
   void setNetwork(String value);
 
+  /**
+   * GCE <a href="https://cloud.google.com/compute/docs/networking">subnetwork</a> for launching
+   * workers.
+   *
+   * <p>Default is up to the Dataflow service.  Expected format is zones/ZONE/subnetworks/SUBNETWORK.
+   */
+  @Description("GCE subnetwork for launching workers. For more information, see the reference "
+      + "documentation https://cloud.google.com/compute/docs/networking. "
+      + "Default is up to the Dataflow service.")
+  String getSubnetwork();
+  void setSubnetwork(String value);
+
   /**
    * GCE <a href="https://developers.google.com/compute/docs/zones"
    * >availability zone</a> for launching workers.

sdk/src/main/java/com/google/cloud/dataflow/sdk/runners/DataflowPipelineTranslator.java

@@ -442,6 +442,9 @@ public Job translate(List<DataflowPackage> packages) {
       if (!Strings.isNullOrEmpty(options.getNetwork())) {
         workerPool.setNetwork(options.getNetwork());
       }
+      if (!Strings.isNullOrEmpty(options.getSubnetwork())) {
+        workerPool.setSubnetwork(options.getSubnetwork());
+      }
       if (options.getDiskSizeGb() > 0) {
         workerPool.setDiskSizeGb(options.getDiskSizeGb());
       }

sdk/src/test/java/com/google/cloud/dataflow/sdk/runners/DataflowPipelineTranslatorTest.java

@@ -230,6 +230,40 @@ public void testNetworkConfigMissing() throws IOException {
     assertNull(job.getEnvironment().getWorkerPools().get(0).getNetwork());
   }
 
+  @Test
+  public void testSubnetworkConfig() throws IOException {
+    final String testSubnetwork = "zones/ZONE/subnetworks/SUBNETWORK";
+
+    DataflowPipelineOptions options = buildPipelineOptions();
+    options.setSubnetwork(testSubnetwork);
+
+    DataflowPipeline p = buildPipeline(options);
+    p.traverseTopologically(new RecordingPipelineVisitor());
+    Job job =
+        DataflowPipelineTranslator.fromOptions(options)
+            .translate(p, p.getRunner(), Collections.<DataflowPackage>emptyList())
+            .getJob();
+
+    assertEquals(1, job.getEnvironment().getWorkerPools().size());
+    assertEquals(testSubnetwork,
+        job.getEnvironment().getWorkerPools().get(0).getSubnetwork());
+  }
+
+  @Test
+  public void testSubnetworkConfigMissing() throws IOException {
+    DataflowPipelineOptions options = buildPipelineOptions();
+
+    DataflowPipeline p = buildPipeline(options);
+    p.traverseTopologically(new RecordingPipelineVisitor());
+    Job job =
+        DataflowPipelineTranslator.fromOptions(options)
+            .translate(p, p.getRunner(), Collections.<DataflowPackage>emptyList())
+            .getJob();
+
+    assertEquals(1, job.getEnvironment().getWorkerPools().size());
+    assertNull(job.getEnvironment().getWorkerPools().get(0).getSubnetwork());
+  }
+
   @Test
   public void testScalingAlgorithmMissing() throws IOException {
     DataflowPipelineOptions options = buildPipelineOptions();