lukecwik commented on a change in pull request #16547:
URL: https://github.com/apache/beam/pull/16547#discussion_r786997483



##########
File path: 
sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/spanner/BatchSpannerRead.java
##########
@@ -193,15 +193,16 @@ public void processElement(ProcessContext c) throws 
Exception {
     }
 
     private ServiceCallMetric createServiceCallMetric(
-        String projectId, String databaseId, String tableId) {
+        @Nullable String projectId, String databaseId, String tableId) {
       HashMap<String, String> baseLabels = new HashMap<>();
       baseLabels.put(MonitoringInfoConstants.Labels.PTRANSFORM, "");
       baseLabels.put(MonitoringInfoConstants.Labels.SERVICE, "Spanner");
       baseLabels.put(MonitoringInfoConstants.Labels.METHOD, "Read");
       baseLabels.put(
           MonitoringInfoConstants.Labels.RESOURCE,
           GcpResourceIdentifiers.spannerTable(projectId, databaseId, tableId));
-      baseLabels.put(MonitoringInfoConstants.Labels.SPANNER_PROJECT_ID, 
projectId);
+      baseLabels.put(
+          MonitoringInfoConstants.Labels.SPANNER_PROJECT_ID, (projectId == 
null ? "" : projectId));

Review comment:
       Is there a reason we aren't using the same project id that 
SpannerOptions relies on  
[ServiceOptions#getDefaultProjectId](https://googleapis.dev/java/google-cloud-clients/0.97.0-alpha/com/google/cloud/ServiceOptions.Builder.html#setProjectId-java.lang.String-)
 if the value provider hasn't set it?
   
   We want to make sure we keep the existing behavior of getting the default 
project id within the execution environment and not when the pipeline is being 
constructed (unless there is a strong reason for the swap).




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