Struct CompactionCounters

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pub struct CompactionCounters {
    pub compactions: u64,
    pub compaction_bytes_written: u64,
    pub compaction_time_ns: u64,
    pub total_layers_added: u64,
    pub max_layer_count: u64,
    pub layer_size_histogram: [u64; 32],
}

Expand description

Metrics related to LSM tree churn, layer depths, and compaction performance.

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§compactions: u64

Total number of compaction events that merged layers together.

§compaction_bytes_written: u64

Total bytes written during compaction, useful for measuring write amplification.

§compaction_time_ns: u64

Total duration spent compacting layers.

§total_layers_added: u64

Number of mutable layers sealed. Useful for measuring churn.

§max_layer_count: u64

The maximum depth of the LSM tree observed. An indicator of worst-case read amplification.

§layer_size_histogram: [u64; 32]

Log2 histogram of the sizes of newly compacted layers, used to verify compaction heuristics.

Trait Implementations§

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impl Default for CompactionCounters

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fn default() -> Self

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

Auto Trait Implementations§

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impl UnwindSafe for CompactionCounters

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unsafe fn encode( self, _encoder: &mut Encoder<'_, D>, _offset: usize, _depth: Depth, ) -> Result<(), Error>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID. Read more

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impl<T, D> Encode<Ambiguous2, D> for T
where D: ResourceDialect,

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unsafe fn encode( self, _encoder: &mut Encoder<'_, D>, _offset: usize, _depth: Depth, ) -> Result<(), Error>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID. Read more

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