[GitHub] [hudi] yuzhaojing commented on a change in pull request #3390: [HUDI-2087] Support Append only in Flink stream

[GitBox <gi...@apache.org>]

yuzhaojing commented on a change in pull request #3390:
URL: https://github.com/apache/hudi/pull/3390#discussion_r682351127



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File path: hudi-flink/src/main/java/org/apache/hudi/table/HoodieTableFactory.java
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@@ -128,6 +129,11 @@ private void validateRequiredFields(Configuration conf, TableSchema schema) {
       throw new ValidationException("Field " + preCombineField + " does not exist in the table schema."
           + "Please check 'write.precombine.field' option.");
     }
+
+    if (conf.getString(FlinkOptions.TABLE_TYPE).toUpperCase().equals(FlinkOptions.TABLE_TYPE_MERGE_ON_READ)
+        && conf.getBoolean(FlinkOptions.INSERT_ALLOW_DUP)) {
+      throw new ValidationException("Option 'write.insert.allow_dup' is only allowed for COPY_ON_WRITE table.");

Review comment:
       This may be lead users to misunderstand, I think we shouldn't modify the parameters.




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