[infinispan-dev] Infinispan "mitosis"

Sanne Grinovero sanne at infinispan.org
Tue Mar 14 10:06:48 EDT 2017


On 14 March 2017 at 13:53, Dan Berindei <dan.berindei at gmail.com> wrote:
> Isn't this a lot like x-site state transfer?

Indeed! Does it mean we could have such a feature with less work?

Maybe some kind of "x-site for dummies" quickstart would be enough,
but re-framing the use case.

Thanks,
Sanne

>
> Dan
>
> On Tue, Mar 14, 2017 at 3:08 PM, Sanne Grinovero <sanne at infinispan.org> wrote:
>> Just throwing out an idea I just had while thinking of Hibernate OGM
>> user needs for data migration.
>>
>> For people using databases & related frameworks, it's common to have a
>> staging database which contains not just the staging "schema" but also
>> data. When legally possible, it's often preferable to have snapshot
>> from production data.
>>
>> For example last time I worked with a SQL database, each week I'd take
>> a production backup and restore it on both our staging environment and
>> on the developer's instances so that everyone could run tests on it -
>> without needing access to the real production.
>>
>> Interestingly, while we don't have an easy tool get a fully consistent
>> snapshot from a live Infinispan grid, "replicating" should be a
>> familiar concept here?
>>
>> Infinispan could have a "mitosis" feature, like cell reproduction, in
>> which the user connects a pristine grid instance of N nodes and these
>> N nodes automatically become non-primary owners for the full set of
>> segments - this could happen via a custom hash which makes them all
>> backup replicas (no main owners) and then Infinispan would be able to
>> tell when state transfer is completed, and initiate some some
>> coordination to sever the link without triggering re-hash on the
>> original "production" grid.
>>
>> Incidentally, while this happens the child datagrid would be kept up
>> to date with in-flight changes, so we could envision either a very
>> short lock on changes to guarantee a fully consistent snapshot, or not
>> have any lock at all but minimise the inconsistencies to those which
>> might happen during the link decoupling.
>>
>> Maybe this would satisfy also the people who've been asking for the
>> snapshot feature? I don't think people want a snapshot for the sake of
>> it, but to replicate the grid..
>>
>> I realise it's not a 1 day of work and the idea is not fully fleshed
>> out, but I think this would be a very well received feature.
>>
>>
>> Thanks,
>> Sanne
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