common_meta::region_keeper

Struct MemoryRegionKeeper

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pub struct MemoryRegionKeeper {
    inner: Arc<RwLock<HashSet<(DatanodeId, RegionId)>>>,
}
Expand description

Tracks regions in memory.

It used in following cases:

  • Tracks the opening regions before the corresponding metadata is created.
  • Tracks the deleting regions after the corresponding metadata is deleted.

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§inner: Arc<RwLock<HashSet<(DatanodeId, RegionId)>>>

Implementations§

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impl MemoryRegionKeeper

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pub fn new() -> Self

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pub fn register( &self, datanode_id: DatanodeId, region_id: RegionId, ) -> Option<OperatingRegionGuard>

Returns OperatingRegionGuard if Region(region_id) on Peer(datanode_id) does not exist.

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pub fn contains(&self, datanode_id: DatanodeId, region_id: RegionId) -> bool

Returns true if the keeper contains a (datanoe_id, region_id) tuple.

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pub fn extract_operating_regions( &self, datanode_id: DatanodeId, region_ids: &mut HashSet<RegionId>, ) -> HashSet<RegionId>

Extracts all operating regions from region_ids and returns operating regions.

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pub fn len(&self) -> usize

Returns number of element in tracking set.

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pub fn is_empty(&self) -> bool

Returns true if it’s empty.

Trait Implementations§

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impl Clone for MemoryRegionKeeper

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fn clone(&self) -> MemoryRegionKeeper

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 MemoryRegionKeeper

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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 MemoryRegionKeeper

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fn default() -> MemoryRegionKeeper

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

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