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From "Zhenya Stanilovsky" <arzamas...@mail.ru.INVALID>
Subject Re: {DISCUSSION] Cluster read-only mode.
Date Thu, 30 May 2019 17:30:37 GMT
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

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