geserdugarov commented on code in PR #12245:
URL: https://github.com/apache/hudi/pull/12245#discussion_r1840236479


##########
hudi-client/hudi-client-common/src/main/java/org/apache/hudi/table/BucketIndexBulkInsertPartitioner.java:
##########
@@ -59,12 +62,19 @@ public BucketIndexBulkInsertPartitioner(HoodieTable table, 
String sortString, bo
       this.sortColumnNames = null;
     }
     this.preserveHoodieMetadata = preserveHoodieMetadata;
+    // Bulk insert into COW table with bucket index is allowed only once, 
otherwise AppendHadleFactory will produce MOR log files
+    this.isAppendAllowed = 
!table.getConfig().getTableType().equals(HoodieTableType.COPY_ON_WRITE);
   }
 
   @Override
   public Option<WriteHandleFactory> getWriteHandleFactory(int idx) {
-    return doAppend.get(idx) ? Option.of(new AppendHandleFactory()) :
-        Option.of(new 
SingleFileHandleCreateFactory(FSUtils.createNewFileId(getFileIdPfx(idx), 0), 
this.preserveHoodieMetadata));
+    if (!doAppend.get(idx)) {
+      return Option.of(new 
SingleFileHandleCreateFactory(FSUtils.createNewFileId(getFileIdPfx(idx), 0), 
this.preserveHoodieMetadata));
+    } else if (isAppendAllowed) {
+      return Option.of(new AppendHandleFactory());
+    } else {
+      throw new HoodieNotSupportedException("Bulk insert into COW table with 
bucket index is allowed only once, please, use upsert operation instead");

Review Comment:
   Yes, you are right. I missed to check overwrite. And there are a lot of 
failed tests in CI. I will check them, to look at other cases, which I missed.



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