Hi Marcel , thanks for the information . I would love to understand the use
cases for having long lived snapshots in oak . Would you be able for
provide specific examples or functions within oak that needs this
capability ?
On Wed, Dec 19, 2018 at 12:43 AM Marcel Reutegger
wrote:
> Hi,
>
> On 18.12.18, 01:55, "ems eril" wrote:
> > 1) Is this a blocking call ? And any plans for callback or java future
> > support?
>
> Yes, Clusterable.isVisible() is a blocking call and you can give it a
> timeout.
> There are no plans right now to add an async variant of this feature.
>
> > 2) Is there any JCR level API we can use as its currently very low level
> ?
>
> No, there is no JCR/Jackrabbit API equivalent for this feature.
>
> > If not is Sling have any plans to use this ?
>
> You will have to ask this on the Sling list.
>
> > 3) Any reason why documentstore needs to implement revision snapshotting
> ?
> > Why can we leverage existing documentstore database capabilities such as
> > mongo https://docs.mongodb.com/manual/core/wiredtiger/ as most support
> MVCC
>
> In Oak we have the requirement to keep a snapshot of the repository for a
> longer
> period of time and not just for concurrency control. E.g. you can create a
> checkpoint
> with a lifetime of several days or even months [0].
>
> Regards
> Marcel
>
> [0]
> https://jackrabbit.apache.org/oak/docs/apidocs/org/apache/jackrabbit/oak/spi/state/NodeStore.html#checkpoint-long-java.util.Map-
>
>
