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From Benjamin Jaton <benjamin.ja...@gmail.com>
Subject Re: Curator PathChildrenCache sends delete events but no delete happened
Date Tue, 25 Oct 2016 18:19:42 GMT
Hi Curtis, thanks for the feedback.
Do you know if there is a JIRA associated to this?
I also use PathChildrenCache to do deletions on the file system. May I ask
how you mitigated the issue?

On Tue, Oct 25, 2016 at 6:17 AM, Cantrell, Curtis <Curtis.Cantrell@bkfs.com>
wrote:

> I have also experienced 3 delete events in the last year when there were
> no actual deletes in ZK.   I was using the delete events as a trigger to do
> an actual deletion in the system.  Since we experienced false deletes, I
> had to rethink the way I was using the PathChildrenCache.
>
>
>
> Thank you,
>
> Curtis Cantrell
>
>
>
>
>
> *From:* Benjamin Jaton [mailto:benjamin.jaton@gmail.com]
> *Sent:* Monday, October 24, 2016 7:34 PM
> *To:* user@curator.apache.org
> *Subject:* Re: Curator PathChildrenCache sends delete events but no
> delete happened
>
>
>
> Hi Cameron, thanks for your answer.
>
> Yes I noticed that too, it seems to be coming from the ZK client layer.
> I have tried to use the ZK Watcher API but I couldn't reproduce the issue
> when I was using them.
>
> I will have a look at how PathChildrenCache does it and keep you posted.
>
> Thanks
>
> Benjamin
>
>
>
> On Mon, Oct 24, 2016 at 4:08 PM, Cameron McKenzie <mckenzie.cam@gmail.com>
> wrote:
>
> hey Benjamin,
>
> I'm not aware of any such edge cases, but that does not mean that they
> don't exist. From the log:
>
>
>
> 2016-10-24 15:52:43 DEBUG o.a.z.ClientCnxn:889 - Got WatchedEvent
> state:SyncConnected type:NodeDeleted path:/benji2/123 for sessionid
> 0x20014cf3d480003
>
>
>
> This is being logged by the Zookeeper client itself that Curator is using.
> So it doesn't appear to be Curator inferring some sort of delete event. It
> looks like an explicit watched event coming from Zookeeper.
>
>
>
> cheers
>
>
>
> On Tue, Oct 25, 2016 at 10:04 AM, Benjamin Jaton <benjamin.jaton@gmail.com>
> wrote:
>
> Hello,
>
> I am using PathChildrenCache and I am receiving delete events even if
> there is no actual delete in ZK. I printed the WatchedEvent details for 2
> of those delete events (of the same node /benji2/123) I received in the
> same JVM run:
>
>
>
> 2016-10-24 15:52:43 DEBUG o.a.z.ClientCnxn:889 - Got WatchedEvent
> state:SyncConnected type:NodeDeleted path:/benji2/123 for sessionid
> 0x20014cf3d480003
> [PathChildrenCacheListener] delete event for /benji2/123
> PathChildrenCacheEvent{type=CHILD_REMOVED, data=ChildData{path='/benji2/123',
> stat=19808389169191,19808389169191,1477335789916,
> 1477335789916,0,0,0,0,0,0,19808389169191
> , data=[]}}
> null
> ChildData{path='/benji2/123', stat=19808389169191,
> 19808389169191,1477335789916,1477335789916,0,0,0,0,0,0,19808389169191
> , data=[]}
> getAversion=0
> 2016-10-24 15:52:43 DEBUG o.a.z.ClientCnxn:867 - Got notification
> sessionid:0x20014cf3d480003
> getCtime=1477335789916
> getCversion=0
> getCzxid=19808389169191
> getMtime=1477335789916
> 2016-10-24 15:52:43 DEBUG o.a.z.ClientCnxn:889 - Got WatchedEvent
> state:SyncConnected type:NodeDeleted path:/benji2 for sessionid
> 0x20014cf3d480003
> getMzxid=19808389169191
> getPzxid=19808389169191
> getVersion=0
>
> (...)
>
> 2016-10-24 15:58:06 DEBUG o.a.z.ClientCnxn:889 - Got WatchedEvent
> state:SyncConnected type:NodeDeleted path:/benji2/123 for sessionid
> 0x20014cf3d480003
> [PathChildrenCacheListener] delete event for /benji2/123
> PathChildrenCacheEvent{type=CHILD_REMOVED, data=ChildData{path='/benji2/123',
> stat=19808389169191,19808389169191,1477335789916,
> 1477335789916,0,0,0,0,0,0,19808389169191
> , data=[]}}
> null
> 2016-10-24 15:58:06 DEBUG o.a.z.ClientCnxn:867 - Got notification
> sessionid:0x20014cf3d480003
> ChildData{path='/benji2/123', stat=19808389169191,
> 19808389169191,1477335789916,1477335789916,0,0,0,0,0,0,19808389169191
> , data=[]}
> getAversion=0
> getCtime=1477335789916
> getCversion=0
> getCzxid=19808389169191
> getMtime=1477335789916
> getMzxid=19808389169191
> getPzxid=19808389169191
> getVersion=0
>
> Are there known edge cases where this can happen? Again there is no delete
> at all in ZK, I verified the transaction log of ZooKeeper, no delete is
> present).
>
> Thanks,
>
> Benjamin
>
>
>
>
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