Houston Putman created CURATOR-719:
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Summary: Race condition enabled by combination of
creatingParentsIfNeeded and orSetData
Key: CURATOR-719
URL: https://issues.apache.org/jira/browse/CURATOR-719
Project: Apache Curator
Issue Type: Bug
Components: Framework
Reporter: Houston Putman
When using {{{}create().orSetData().creatingParentsIfNeeded().forPath(path,
data){}}}, a race condition exists that will ignore the {{orSetData()}} option
if parents aren't created.
So if there are two parallel processes creating the same node with the settings
above, both will hit a "NoNodeException", which will take them down the path of
creating the parents. Once both are done with that, which seems to handle the
parallelism fine, they will both try to create the target zNode ({*}path{*}
above). However, in this code path, the {{orSetData()}} option is not used, so
one will succeed, and create the zNode, and the other will fail because the
zNode has already been created by the other process.
What should happen, is that the {{orSetData()}} option is used in this {{catch
(NoNodeException)}} block, and the second process will set the data and not
throw an error.
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