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 <arzamas...@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
