curator-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From John Vines <vi...@apache.org>
Subject Re: Transaction question
Date Thu, 02 Oct 2014 18:15:43 GMT
In the set data iterator, there is a with version method you can use to set
to guarantee the read-modify-write is uninterrupted.

Sent from my phone, please pardon the typos and brevity.
On Oct 2, 2014 1:39 PM, "Benjamin Jaton" <bjaton@radiantlogic.com> wrote:

> Hi Vines, I'm not sure I understand what you mean:
> The only methods that will give you a stat object are getData() , exists()
> and getChildren(), how can I know the node hasn't been updated when I do a
> setData()?
>
>
> On Thu, Sep 25, 2014 at 6:08 AM, John Vines <vines@apache.org> wrote:
>
>> Another option is to use the Stat object so you can do a
>> read-modify-write to guarantee that you're writing over the value you read.
>>
>> On Wed, Sep 24, 2014 at 5:28 PM, Benjamin Jaton <bjaton@radiantlogic.com>
>> wrote:
>>
>>> It's more a "compare-and-set type operation" but on the same node.
>>> I think I have to do a lock indeed.
>>>
>>> Thanks!
>>>
>>> On Wed, Sep 24, 2014 at 8:35 AM, Jordan Zimmerman <
>>> jordan@jordanzimmerman.com> wrote:
>>>
>>>> There are no ZooKeeper APIs that will allow you to atomically check the
>>>> value of a node and change another node based on that value. You’d need
to
>>>> write a recipe for that. i.e. get a lock (InterProcessMutex), get the
>>>> value, change another value, release the lock.
>>>>
>>>> -JZ
>>>>
>>>>
>>>> On September 23, 2014 at 6:48:19 PM, Benjamin Jaton (
>>>> bjaton@radiantlogic.com) wrote:
>>>>
>>>> Hello,
>>>>
>>>> I would like to know if there is a way to get the value of a node,
>>>> update it and save it, all in the same transaction. I have been looking for
>>>> a way to do that but no luck.
>>>> Any idea?
>>>>
>>>> Thanks
>>>> Ben
>>>>
>>>>
>>>
>>
>

Mime
View raw message