Github user tillrohrmann commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3881#discussion_r116185935
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/zookeeper/ZooKeeperStateHandleStore.java
 ---
    @@ -346,11 +346,7 @@ public int exists(String pathInZooKeeper) throws 
Exception {
                        } else {
                                // Initial cVersion (number of changes to the 
children of this node)
                                int initialCVersion = stat.getCversion();
    -
    -                           List<String> children = 
ZKPaths.getSortedChildren(
    -                                           
client.getZookeeperClient().getZooKeeper(),
    -                                           
ZKPaths.fixForNamespace(client.getNamespace(), "/"));
    -
    +                           List<String> children = 
client.getZookeeperClient().getZooKeeper().getChildren(ZKPaths.fixForNamespace(client.getNamespace(),
 "/"), false);
    --- End diff --
    
    I think this alone does not work: The JavaDocs of `ZooKeeper#getChildren` 
say
    
    > The list of children returned is not sorted and no guarantee is provided 
as to its natural or lexical order.
    
    Thus, I assume that it is not safe to simply return the list of children 
without any further processing.


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