meta_srv::procedure::region_migration

Struct VolatileContext

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pub struct VolatileContext {
    opening_region_guard: Option<OperatingRegionGuard>,
    table_route: Option<DeserializedValueWithBytes<TableRouteValue>>,
    from_peer_datanode_table: Option<DatanodeTableValue>,
    table_info: Option<DeserializedValueWithBytes<TableInfoValue>>,
    leader_region_lease_deadline: Option<Instant>,
    leader_region_last_entry_id: Option<u64>,
    operations_elapsed: Duration,
}
Expand description

It’s shared in each step and available in executing (including retrying).

It will be dropped if the procedure runner crashes.

The additional remote fetches are only required in the worst cases.

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§opening_region_guard: Option<OperatingRegionGuard>

opening_region_guard will be set after the OpenCandidateRegion step.

opening_region_guard should be consumed after the corresponding RegionRoute of the opening region was written into TableRouteValue.

§table_route: Option<DeserializedValueWithBytes<TableRouteValue>>

table_route is stored via previous steps for future use.

§from_peer_datanode_table: Option<DatanodeTableValue>

datanode_table is stored via previous steps for future use.

§table_info: Option<DeserializedValueWithBytes<TableInfoValue>>

table_info is stored via previous steps for future use.

table_info should remain unchanged during the procedure; no other DDL procedure executed concurrently for the current table.

§leader_region_lease_deadline: Option<Instant>

The deadline of leader region lease.

§leader_region_last_entry_id: Option<u64>

The last_entry_id of leader region.

§operations_elapsed: Duration

Elapsed time of downgrading region and upgrading region.

Implementations§

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impl VolatileContext

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pub fn set_leader_region_lease_deadline(&mut self, lease_timeout: Duration)

Sets the leader_region_lease_deadline if it does not exist.

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pub fn reset_leader_region_lease_deadline(&mut self)

Resets the leader_region_lease_deadline.

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pub fn set_last_entry_id(&mut self, last_entry_id: u64)

Sets the leader_region_last_entry_id.

Trait Implementations§

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impl Clone for VolatileContext

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fn clone(&self) -> VolatileContext

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for VolatileContext

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for VolatileContext

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fn default() -> VolatileContext

Returns the “default value” for a type. Read more

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