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From Sergey Antonov <antonovserge...@gmail.com>
Subject Re: {DISCUSSION] Cluster read-only mode.
Date Fri, 31 May 2019 09:59:38 GMT
Hello, Zhenya, Maxim!

Thank you for your replies!

>> Should we also allow writes to the DistributedMetaStorage and if not why?
Yes. DistributedMetastorage available for updates with enabled read-only
mode. I added test about it to ClusterReadOnlyModeSelfTest

>> What's the purpose for ignite-sys-cache updates still be available ?
ignite-sys-cache is using in the different subcomponents, for example,
security.

чт, 30 мая 2019 г. в 20:30, Zhenya Stanilovsky <arzamas123@mail.ru.invalid>:

> hi, Sergey.
> What's the purpose for ignite-sys-cache updates still be available ?
>
> thanks !
>
> > Hello Igniters!
> >
> > I'm working on cluster read-only mode [1] feature. In this mode cluster
> > will be available only for read operations, all data modification
> > operations in user caches will be rejected
> > with ClusterReadOnlyModeCheckedException. This feature could be helpfull
> > for maintenance works (control.sh idle_verify/validate_indexes).
> >
> > A few points about cluster read-only mode:
> > 1) Read-only mode could be enabled on active cluster only.
> > 2) Read-only mode doens't store on PDS (i.e. after cluster restart
> > enabled
> > read-only mode will be forgotten)
> > 3) Updates to ignite-sys-cache will be available with enabled read-only
> > mode.
> >
> > More informartion about implementation you could find in PR [2].
> >
> > What do you think about this feature?
> >
> > [1] https://issues.apache.org/jira/browse/IGNITE-11256
> > [2] https://github.com/apache/ignite/pull/6423
>


-- 
BR, Sergey Antonov

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