Mailing-List: contact zookeeper-user-help@hadoop.apache.org; run by ezmlm
Precedence: bulk
Reply-To: zookeeper-user@hadoop.apache.org
Received-SPF: neutral (athena.apache.org: local policy)
MIME-Version: 1.0
In-Reply-To: <4B82BBDC.1030104@apache.org>
References: <b71985371002220800h46559d2an2f9e2ad2f510476c@mail.gmail.com>
	 <4B82B0EA.6050804@yahoo-inc.com> <4B82BBDC.1030104@apache.org>
Date: Mon, 22 Feb 2010 09:30:28 -0800
Message-ID: <b71985371002220930rfad522dhfb0de59129486007@mail.gmail.com>
Subject: Re: Znode ACL watcher?
From: Mark Masse <mark@massedynamic.org>
To: zookeeper-user@hadoop.apache.org
Content-Type: multipart/alternative; boundary=0016e6d77df50e85fd048033ca8b

--0016e6d77df50e85fd048033ca8b
Content-Type: text/plain; charset=ISO-8859-1

Thanks guys.

I don't have a strong use case but it did seem something of an
oddity/incompleteness when I was implementing the eclipse plug-in to
dynamically respond to znode changes.  Without a Watcher available, it means
that ACL changes are the one instance where a user has to manually click
"Refresh" to see the latest version.

This is clearly a UI-centric example, but I am not aware of any *normal* use
cases where this would be an issue.

Regards,

 --
Mark Masse
http://www.massedynamic.org


On Mon, Feb 22, 2010 at 9:16 AM, Patrick Hunt <phunt@apache.org> wrote:

> Feel free to enter JIRA(s) if you feel strongly. I agree with Ben in the
> sense that I haven't heard of any use cases that require this, but a JIRA
> with examples might strengthen the case.
>
> Patrick
>
>
> Benjamin Reed wrote:
>
>> no, you cannot watch for ACL changes. it is one of the API/implementation
>> simplifications we did since we didn't have a good use case for it.
>>
>> it does seem a little bit weird. we are following file system semantics
>> here. i guess for ultimate security only clients with admin permission would
>> be able to see an ACL.
>>
>> ben
>>
>> On 02/22/2010 08:00 AM, Mark Masse wrote:
>>
>>> Hi,
>>>
>>> Does anyone know if there's a way to get a Watcher notification when a
>>> znode's ACL changes?
>>>
>>> I also wanted to ask if it seems weird that you can "read" a znode's ACL
>>> even if you don't have permissions to read the data.
>>>
>>> Thanks,
>>>
>>>  --
>>> Mark Masse
>>> http://www.massedynamic.org
>>>
>>>
>>
>>

--0016e6d77df50e85fd048033ca8b--