hadoop-yetus commented on a change in pull request #533: HADOOP-14630  Contract 
Tests to verify create, mkdirs and rename under a file is forbidden
URL: https://github.com/apache/hadoop/pull/533#discussion_r264008750
 
 

 ##########
 File path: 
hadoop-common-project/hadoop-common/src/site/markdown/filesystem/filesystem.md
 ##########
 @@ -524,9 +524,17 @@ Create a directory and all its parents
 #### Preconditions
 
 
+The path must either be a directory or not exist
+ 
      if exists(FS, p) and not isDir(FS, p) :
          raise [ParentNotDirectoryException, FileAlreadyExistsException, 
IOException]
 
+No ancestor may be a file
+
+    forall d = ancestors(FS, p) : 
+        if exists(FS, d) and not isDir(FS, d) :
+            raise [ParentNotDirectoryException, FileAlreadyExistsException, 
IOException]
+    
 
 Review comment:
   whitespace:end of line
   

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