Graceful policy should only be applicable to caches having a number of
backups > 0.
пн, 8 июн. 2020 г. в 14:54, Alexei Scherbakov <alexey.scherbak...@gmail.com
>:
> V.Pyatkov
>
>
> While I agree we need a way to prevent unintentional data loss on
> shutdown, I do not like the proposed shutdown flags enum.
> I see no relation between possible data loss on shutdown and waiting for
> some jobs to complete.
>
> All we need is a new method (duplicated by system property), like
>
> IgniteConfiguration.setShutdownPolicy(GRACEFUL|DEFAULT);
> and an optional
> IgniteConfiguration.setGracefulShutdownTimeout(long); // Force a shutdown
> if the timeout is expired.
>
> For enabled graceful policy a node shouldn't normally stop if it is the
> last owner for any partition.
> This will prevent unintentional data loss on stop when it is possible, for
> example if a grid is deployed over kubernetes.
>
> The properties also should be changeable at runtime using JMX or
> control.sh interface.
>
>
>
>
> пн, 8 июн. 2020 г. в 13:46, V.Pyatkov <vldpyat...@gmail.com>:
>
>> Hi
>>
>> We need to have ability to calling shutdown with various guaranties.
>> For example:
>> Need to reboot a node, but after that node should be available for
>> historical rebalance (all partitions in MOVING state should have gone to
>> OWNING).
>>
>> Implemented a circled reboot of cluster, but all data should be available
>> on
>> that time (at least one copy of partition should be available in cluster).
>>
>> Need to wait not only data available, but all jobs (before this behavior
>> available through a stop(false) method invocation).
>>
>> All these reason required various behavior before shutting down node.
>> I propose slightly modify public API and add here method which shown on
>> shutdown behavior directly:
>> Ignite.close(Shutdown)
>>
>> /public enum Shutdownn {
>> /**
>> * Stop immediately as soon components are ready.
>> */
>> IMMEDIATE,
>> /**
>> * Stop node when all partitions completed moving from/to this node to
>> another.
>> */
>> NORMAL,
>> /**
>> * Node will stop if and only if it does not store any unique
>> partitions, that does not have copies on cluster.
>> */
>> GRACEFUL,
>> /**
>> * Node stops graceful and wait all jobs before shutdown.
>> */
>> ALL
>> }/
>>
>> Method close without parameter Ignite.close() will get shutdown behavior
>> configured for cluster wide. It will be implemented through distributed
>> meta
>> storage and additional utilities for configuration.
>> Also, will be added a method to configure shutdown on start, this is look
>> as
>> IgniteConfiguration.setShutdown(Shutdown).
>> If shutting down did not configure all be worked as before according to
>> IMMEDIATE behavior.
>> All other close method will be marked as deprecated.
>>
>> I will be waiting for your opinions.
>>
>>
>>
>> --
>> Sent from: http://apache-ignite-developers.2346864.n4.nabble.com/
>>
>
>
> --
>
> Best regards,
> Alexei Scherbakov
>
--
Best regards,
Alexei Scherbakov
