the-other-tim-brown commented on code in PR #9482:
URL: https://github.com/apache/hudi/pull/9482#discussion_r1306318476


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hudi-gcp/src/main/java/org/apache/hudi/gcp/bigquery/BigQuerySyncTool.java:
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@@ -52,34 +57,55 @@ public class BigQuerySyncTool extends HoodieSyncTool {
 
   private static final Logger LOG = 
LoggerFactory.getLogger(BigQuerySyncTool.class);
 
-  public final BigQuerySyncConfig config;
-  public final String tableName;
-  public final String manifestTableName;
-  public final String versionsTableName;
-  public final String snapshotViewName;
+  private final BigQuerySyncConfig config;
+  private final String tableName;
+  private final String manifestTableName;
+  private final String versionsTableName;
+  private final String snapshotViewName;
+  private final ManifestFileWriter manifestFileWriter;
+  private final HoodieBigQuerySyncClient bqSyncClient;
+  private final HoodieTableMetaClient metaClient;
+  private final BigQuerySchemaResolver bqSchemaResolver;
 
   public BigQuerySyncTool(Properties props) {
-    super(props);
+    // will build file writer, client, etc. from configs
+    this(props, null, null, null, null);
+  }
+
+  @VisibleForTesting // allows us to pass in mocks for the writer and client

Review Comment:
   @nsivabalan i will defer to you, can you please provide a way to get the 
equivalent mocking ability under the constraint that the meta sync is required 
to have a single arg constructor? I don't have as much Hudi experience but was 
just following the general java dependency injection practice. 



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