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From Cameron McKenzie <mckenzie....@gmail.com>
Subject Re: Why PathChildrenCache does not have "cversion"?
Date Wed, 21 Oct 2015 04:59:56 GMT
You can set a max depth for the tree cache. You should just be able to set
a max depth of 1?

On Wed, Oct 21, 2015 at 3:46 PM, Luo Fucong <bayinamine@gmail.com> wrote:

> My requirement is building a tree with only one level (root plus its first
> level children). TreeCache, however, will build the entire tree with
> however many levels the root has.
>
> So basically, I need a “NodePathChildrenCache” that’s NodeCache +
> PathChildrenCache :)
>
> > 在 2015年10月21日,下午12:37,Jordan Zimmerman <jordan@jordanzimmerman.com>
写道:
> >
> > Well, that’s not what PathChildrenCache is for. You could start a
> NodeCache for the parent node I guess. Or use TreeCache. But, I don’t know
> what the use case is so I can’t comment in more detail.
> >
> > -Jordan
> >
> >> On Oct 20, 2015, at 11:34 PM, Luo Fucong <bayinamine@gmail.com> wrote:
> >>
> >> Thanks for the reply.
> >>
> >> Sorry for the ambiguous meaning of “path node”. By saying “path node”,
> I mean the common root node of the children.
> >>
> >> So PathChildrenCach does store the children nodes Stat, but it does not
> store the root node's Stat.
> >>
> >> For instance, I have created a PathChildrenCach cache = new
> PathChildrenCache(“/path/to/node”).
> >> I can get the Stat of “/path/to/node/child1”, but I cannot get the Stat
> of “/path/to/node” directly from the cache.
> >>
> >>> 在 2015年10月21日,下午12:18,Jordan Zimmerman <jordan@jordanzimmerman.com>
> 写道:
> >>>
> >>> PathChildrenCache stores the node’s Stat object in the ChildData. So,
> all the data you want is there.
> >>>
> >>> -JZ
> >>>
> >>>> On Oct 20, 2015, at 11:13 PM, 罗傅聪 <bayinamine@gmail.com>
wrote:
> >>>>
> >>>> Hi all:
> >>>>
> >>>> I recently went through the PathChildrenCache source code (in
> curator-recipes-2.9.0) and found that it does not store the path node’s
> “cversion”, which indicating the number of changes to the children of this
> znode. (Correct me if I’m wrong.)
> >>>>
> >>>> I think the “cversion” is a very important version number which
> enable us to verify that the PathChildrenCache is really catch up to the
> remote zookeeper znodes.
> >>>>
> >>>> So I’m wondering that:
> >>>>
> >>>> 1. why the PathChildrenCache does not store “cversion”, or
> furthermore, why it does not store the path node’s status?
> >>>>
> >>>> 2. are there other means I can use to verify that the
> PathChildrenCache is not falling behind the remote znodes?
> >>>>
> >>>> Thanks!
> >>>
> >>
> >
>
>

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