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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (CURATOR-258) PersistentEphemeralNode stops watching after first WatchedEvent
Date Sat, 19 Sep 2015 07:04:04 GMT


ASF GitHub Bot commented on CURATOR-258:

Github user cammckenzie commented on the pull request:
    Looks good to me, anyone else want to have a look? If not, I'll merge.

> PersistentEphemeralNode stops watching after first WatchedEvent
> ---------------------------------------------------------------
>                 Key: CURATOR-258
>                 URL:
>             Project: Apache Curator
>          Issue Type: Bug
>          Components: Recipes
>    Affects Versions: 3.0.0, 2.8.0, 2.9.0, 2.9.1
>            Reporter: Njal Karevoll
> The `Watcher` in the `PersistentEphemeralNode` recipe only reacts to the `NodeDeleted`
event. But it's possible to receive a `NodeDataChanged` event as well due to
>  1. The node has been created before the recipe has been started, so the first event
it receives is it's own update.
>  2. The node has been created by another session, and the recipe accepts updating nodes
belonging to a different session. In this case, it also receives it's own update in the `Watcher`,
and no longer watches the node when the `NodeDeleted` event comes through (after the session
of the other client expires). This is easily reproducible by restarting a service using a
the recipe when the session timeout is higher than the service restart time. 

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