wangyum commented on code in PR #1139:
URL: https://github.com/apache/parquet-mr/pull/1139#discussion_r1403826524


##########
parquet-hadoop/README.md:
##########
@@ -501,3 +501,11 @@ If `false`, key material is stored in separate new files, 
created in the same fo
 **Description:** Length of key encryption keys (KEKs), randomly generated by 
parquet key management tools. Can be 128, 192 or 256 bits.  
 **Default value:** `128`
 
+---
+
+**Property:** `parquet.hadoop.vectored.io.enabled`  
+**Description:** Flag to enable use of the FileSystem Vector IO API on Hadoop 
releases which support the feature.
+If `true` then an attempt will be made to dynamically load the relevant 
classes; 

Review Comment:
   Does this feature need to upgrade NameNode and DataNode?



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