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https://issues.apache.org/jira/browse/IGNITE-22507?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aleksandr Polovtsev updated IGNITE-22507:
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Ignite Flags: (was: Docs Required,Release Notes Required)
> Add MvPartitionStorage#estimatedSize method
> -------------------------------------------
>
> Key: IGNITE-22507
> URL: https://issues.apache.org/jira/browse/IGNITE-22507
> Project: Ignite
> Issue Type: Improvement
> Reporter: Vladimir Pligin
> Assignee: Aleksandr Polovtsev
> Priority: Critical
> Labels: ignite-3
>
> I propose to add a method to the {{MvPartitionStorage}} interface that will
> allow to get an *estimated* size of a partition. This method will have the
> following limitations:
> # It only allows to calculate the amount of the *most recent* data (i.e. data
> located at the tops of version chains), no time-traveling is allowed.
> # It provides the size of the partition regardless any ongoing transaction
> data (i.e. write intents are not resolved and are omitted);
> # Calling this method should be performed fast, no partition scanning is
> allowed. It is proposed to have a counter that will be both stored in memory
> and on the persistent storage (for persistent storage engines) and that will
> be updated when a transaction commits.
> The following should be done in this ticket:
> # Add the {{MvPartitionStorage#estimatedSize}} method declaration with a
> javadoc;
> # Implement this method in the {{TestMvPartitionStorage}};
> # Add tests that can later be reused by all other implementations of
> partition storages.
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