pub struct RegionAliveKeeper {
region_server: RegionServer,
tasks: Arc<Mutex<HashMap<RegionId, Arc<CountdownTaskHandle>>>>,
heartbeat_interval_millis: u64,
started: Arc<AtomicBool>,
epoch: Instant,
countdown_task_ext_handler: Option<CountdownTaskHandlerExtRef>,
}
Expand description
RegionAliveKeeper manages all CountdownTaskHandles.
RegionAliveKeeper starts a CountdownTask for each region. When the deadline is reached, the status of region be set to “readonly”, ensures there is no side-effect in the entity system.
The deadline is controlled by the meta server. Datanode will send its opened regions info to meta sever via heartbeat. If the meta server decides some region could be resided in this Datanode, it will renew the lease of region, a deadline of CountdownTask will be reset.
Fields§
§region_server: RegionServer
§tasks: Arc<Mutex<HashMap<RegionId, Arc<CountdownTaskHandle>>>>
§heartbeat_interval_millis: u64
§started: Arc<AtomicBool>
§epoch: Instant
The epoch when RegionAliveKeeper is created. It’s used to get a monotonically non-decreasing elapsed time when submitting heartbeats to the meta server (because [Instant] is monotonically non-decreasing). The heartbeat requests will carry the duration since this epoch, and the duration acts like an “invariant point” for region’s keep alive lease.
countdown_task_ext_handler: Option<CountdownTaskHandlerExtRef>
Implementations§
Source§impl RegionAliveKeeper
impl RegionAliveKeeper
Sourcepub fn new(
region_server: RegionServer,
countdown_task_ext_handler: Option<CountdownTaskHandlerExtRef>,
heartbeat_interval_millis: u64,
) -> Self
pub fn new( region_server: RegionServer, countdown_task_ext_handler: Option<CountdownTaskHandlerExtRef>, heartbeat_interval_millis: u64, ) -> Self
Returns an empty RegionAliveKeeper.
async fn find_handle( &self, region_id: RegionId, ) -> Option<Arc<CountdownTaskHandle>>
Sourcepub async fn register_region(&self, region_id: RegionId)
pub async fn register_region(&self, region_id: RegionId)
Add the countdown task for a specific region. It will be ignored if the task exists.
Sourcepub async fn deregister_region(&self, region_id: RegionId)
pub async fn deregister_region(&self, region_id: RegionId)
Removes the countdown task for a specific region.
Sourceasync fn renew_region_leases(
&self,
regions: &[GrantedRegion],
deadline: Instant,
)
async fn renew_region_leases( &self, regions: &[GrantedRegion], deadline: Instant, )
Renews the lease of regions to deadline
.
async fn close_staled_region(&self, region_id: RegionId)
Sourceasync fn close_staled_regions(&self, regions: &[u64])
async fn close_staled_regions(&self, regions: &[u64])
Closes staled regions.
pub async fn start( self: &Arc<Self>, event_receiver: Option<RegionServerEventReceiver>, ) -> Result<()>
pub fn epoch(&self) -> Instant
Trait Implementations§
Source§impl HeartbeatResponseHandler for RegionAliveKeeper
impl HeartbeatResponseHandler for RegionAliveKeeper
fn is_acceptable(&self, ctx: &HeartbeatResponseHandlerContext) -> bool
fn handle<'life0, 'life1, 'async_trait>(
&'life0 self,
ctx: &'life1 mut HeartbeatResponseHandlerContext,
) -> Pin<Box<dyn Future<Output = Result<HandleControl>> + Send + 'async_trait>>where
Self: 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait,
Auto Trait Implementations§
impl Freeze for RegionAliveKeeper
impl !RefUnwindSafe for RegionAliveKeeper
impl Send for RegionAliveKeeper
impl Sync for RegionAliveKeeper
impl Unpin for RegionAliveKeeper
impl !UnwindSafe for RegionAliveKeeper
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