m-trieu commented on code in PR #30320:
URL: https://github.com/apache/beam/pull/30320#discussion_r1491496488


##########
sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/BigQuerySinkMetrics.java:
##########
@@ -326,6 +337,83 @@ public static void reportFailedRPCMetrics(
     updateRpcLatencyMetric(c, method);
   }
 
+  /**
+   * Results of a batch of InsertAll RPCs. Used to update metrics with the 
{@code
+   * updateStreamingInsertsMetrics} method. Member variables should be 
thread-safe.
+   */
+  public static class StreamingInsertsResults {

Review Comment:
   if this is a data class, can you use AutoValue? 
   
https://g3doc.corp.google.com/third_party/java_src/auto/value/g3doc/index.md?cl=head
   
   can also annotate with `@ThreadSafe` instead of commenting
   
   also the members are threadsafe individually, but if you need atomic 
operations across multiple members that will still require a lock 
(`synchronized (someObject)`)



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