Merge pull request #459 from dhalperi/containers-180

Version management: use 1.8.0 worker container

Author: dhalperi

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

@@ -221,9 +221,9 @@ public class DataflowPipelineRunner extends PipelineRunner<DataflowPipelineJob>
   // Default Docker container images that execute Dataflow worker harness, residing in Google
   // Container Registry, separately for Batch and Streaming.
   public static final String BATCH_WORKER_HARNESS_CONTAINER_IMAGE
-      = "dataflow.gcr.io/v1beta3/java-batch:1.7.0";
+      = "dataflow.gcr.io/v1beta3/java-batch:1.8.0";
   public static final String STREAMING_WORKER_HARNESS_CONTAINER_IMAGE
-      = "dataflow.gcr.io/v1beta3/java-streaming:1.7.0";
+      = "dataflow.gcr.io/v1beta3/java-streaming:1.8.0";
 
   // The limit of CreateJob request size.
   private static final int CREATE_JOB_REQUEST_LIMIT_BYTES = 10 * 1024 * 1024;