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https://issues.apache.org/jira/browse/CURATOR-310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15576653#comment-15576653
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ASF GitHub Bot commented on CURATOR-310:
----------------------------------------

Github user fiksn commented on the issue:

    https://github.com/apache/curator/pull/140
  
    Wouldn't it also make sense to use waitForInitialCreate() in GroupMember's 
setThisData()? I seem to be getting the same issue and can't directly access 
the underlying PersistentEphemeralNode.


> Race in PersistentNode startup
> ------------------------------
>
>                 Key: CURATOR-310
>                 URL: https://issues.apache.org/jira/browse/CURATOR-310
>             Project: Apache Curator
>          Issue Type: Bug
>          Components: Recipes
>    Affects Versions: 2.10.0
>            Reporter: Gerd Behrmann
>            Assignee: Jordan Zimmerman
>             Fix For: 2.11.0, 3.2.0
>
>
> We ran into what looks like a race in PersisentNode startup:
> java.lang.IllegalArgumentException: Path cannot be null
>         at org.apache.curator.utils.PathUtils.validatePath(PathUtils.java:48) 
> ~[curator-client-2.10.0.jar:na]
>         at org.apache.curator.utils.PathUtils.validatePath(PathUtils.java:37) 
> ~[curator-client-2.10.0.jar:na]
>         at org.apache.curator.utils.ZKPaths.fixForNamespace(ZKPaths.java:105) 
> ~[curator-client-2.10.0.jar:na]
>         at 
> org.apache.curator.framework.imps.NamespaceImpl.fixForNamespace(NamespaceImpl.java:104)
>  ~[curator-framework-2.10.0.jar:na]
>         at 
> org.apache.curator.framework.imps.CuratorFrameworkImpl.fixForNamespace(CuratorFrameworkImpl.java:594)
>  ~[curator-framework-2.10.0.jar:na]
>         at 
> org.apache.curator.framework.imps.SetDataBuilderImpl.forPath(SetDataBuilderImpl.java:244)
>  ~[curator-framework-2.10.0.jar:na]
>         at 
> org.apache.curator.framework.imps.SetDataBuilderImpl.forPath(SetDataBuilderImpl.java:41)
>  ~[curator-framework-2.10.0.jar:na]
>         at 
> dmg.cells.zookeeper.CellCuratorFramework$PathAndBytesableDecorator.forPath(CellCuratorFramework.java:1369)
>  ~[cells-2.16.0-SNAPSHOT.jar:2.16.0-SNAPSHOT]
>         at 
> org.apache.curator.framework.recipes.nodes.PersistentNode.setData(PersistentNode.java:323)
>  ~[curator-recipes-2.10.0.jar:na]
> The problem here is that PersistentNode#setData calls 
> PersistentNode#getActualPath, however the nodePath field accessed by 
> PersistentNode#getActualPath isn't set until 
> PersistentNode#processBackgroundCallback is called as a result of the 
> createNode call in PersistentNode#start. 
> I.e. if one calls PersistentNode#setData right after calling start, there is 
> a race between the node creation initializing the actual path and 
> PersistentNode#setData accessing it.



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