RegionMigrationStart

meta_srv::procedure::region_migration::migration_start

Struct RegionMigrationStart 

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pub struct RegionMigrationStart;
Expand description

The behaviors:

If the expected leader region has been opened on to_peer, go to the RegionMigrationEnd state.

If the candidate region has been opened on to_peer, go to the UpdateMetadata::Downgrade state.

Otherwise go to the OpenCandidateRegion state.

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impl RegionMigrationStart

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async fn retrieve_region_route( &self, ctx: &mut Context, region_id: RegionId, ) -> Result<RegionRoute>

Retrieves region route.

Abort(non-retry):

  • TableRoute is not found.
  • RegionRoute is not found.

Retry:

  • Failed to retrieve the metadata of table.
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fn check_candidate_region_on_peer( &self, region_route: &RegionRoute, to_peer: &Peer, ) -> bool

Checks whether the candidate region on region has been opened. Returns true if it’s been opened.

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fn invalid_leader_peer( &self, region_route: &RegionRoute, from_peer: &Peer, ) -> Result<bool>

Returns true if the region leader is not the from_peer.

Abort(non-retry):

  • Leader peer of RegionRoute is not found.
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fn has_migrated( &self, region_route: &RegionRoute, to_peer: &Peer, ) -> Result<bool>

Checks whether the region has been migrated. Returns true if it’s.

Abort(non-retry):

  • Leader peer of RegionRoute is not found.

Trait Implementations§

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impl Debug for RegionMigrationStart

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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<'de> Deserialize<'de> for RegionMigrationStart

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl Serialize for RegionMigrationStart

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl State for RegionMigrationStart

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fn next<'life0, 'life1, 'life2, 'async_trait>( &'life0 mut self, ctx: &'life1 mut Context, _procedure_ctx: &'life2 ProcedureContext, ) -> Pin<Box<dyn Future<Output = Result<(Box<dyn State>, Status)>> + Send + 'async_trait>>
where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Yields next State.

If the expected leader region has been opened on to_peer, go to the RegionMigrationEnd state.

If the candidate region has been opened on to_peer, go to the UpdateMetadata::Downgrade state.

Otherwise go to the OpenCandidateRegion state.

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fn as_any(&self) -> &dyn Any

Returns as Any.
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fn name(&self) -> &'static str

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