xiangqiao123 commented on a change in pull request #9935:
URL: https://github.com/apache/druid/pull/9935#discussion_r449572296



##########
File path: 
server/src/main/java/org/apache/druid/metadata/IndexerSQLMetadataStorageCoordinator.java
##########
@@ -77,12 +79,14 @@
 import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.stream.Collectors;
 
 /**
  */
 public class IndexerSQLMetadataStorageCoordinator implements 
IndexerMetadataStorageCoordinator
 {
   private static final Logger log = new 
Logger(IndexerSQLMetadataStorageCoordinator.class);
+  private static final int ANNOUNCE_HISTORICAL_SEGMENG_BATCH = 100;

Review comment:
       The number 100 is just experience. 




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