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LookupMetricsSnapshot

mongreldb_core::engine

Struct LookupMetricsSnapshot 

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pub struct LookupMetricsSnapshot {
Show 38 fields
    pub hot_lookup_hit: u64,
    pub hot_lookup_fallback: u64,
    pub hot_lookup_fallback_overlay_rows: u64,
    pub hot_lookup_fallback_runs: u64,
    pub result_cache_memory_hit: u64,
    pub result_cache_disk_hit: u64,
    pub result_cache_miss: u64,
    pub result_cache_persistent_write_us: u64,
    pub get_run_opened: u64,
    pub get_run_skipped: u64,
    pub directory_lookup_hit: u64,
    pub directory_lookup_fallback: u64,
    pub directory_incomplete: u64,
    pub directory_run_readers_opened: u64,
    pub directory_early_stop_total: u64,
    pub directory_complete_miss_total: u64,
    pub result_cache_persist_enqueued_total: u64,
    pub result_cache_persist_coalesced_total: u64,
    pub result_cache_persist_dropped_store_total: u64,
    pub result_cache_persist_remove_total: u64,
    pub result_cache_persist_stale_store_skipped_total: u64,
    pub result_cache_persist_errors_total: u64,
    pub result_cache_persist_shutdown_abandoned_total: u64,
    pub result_cache_persist_queue_depth: u64,
    pub result_cache_persist_unavailable_total: u64,
    pub result_cache_persist_skipped_total: u64,
    pub result_cache_worker_spawn_failures_total: u64,
    pub result_cache_worker_shutdown_total: u64,
    pub hot_fallback_reasons: [u64; 9],
    pub hot_fallback_overlay_versions_total: u64,
    pub hot_fallback_runs_considered_total: u64,
    pub hot_fallback_runs_opened_total: u64,
    pub hot_fallback_pages_decoded_total: u64,
    pub hot_fallback_rows_materialized_total: u64,
    pub hot_lookup_duration_nanos: u64,
    pub hot_fallback_duration_nanos: u64,
    pub hot_mapping_rebuild_total: u64,
    pub hot_checkpoint_rejected_total: u64,

}
Expand description

Point-in-time copy of LookupMetrics. Returned from Table::lookup_metrics_snapshot for /metrics exposure or test assertions.

Fields§

§hot_lookup_hit: u64§hot_lookup_fallback: u64§hot_lookup_fallback_overlay_rows: u64§hot_lookup_fallback_runs: u64§result_cache_memory_hit: u64§result_cache_disk_hit: u64§result_cache_miss: u64§result_cache_persistent_write_us: u64§get_run_opened: u64§get_run_skipped: u64§directory_lookup_hit: u64§directory_lookup_fallback: u64§directory_incomplete: u64§directory_run_readers_opened: u64§directory_early_stop_total: u64§directory_complete_miss_total: u64§result_cache_persist_enqueued_total: u64§result_cache_persist_coalesced_total: u64§result_cache_persist_dropped_store_total: u64§result_cache_persist_remove_total: u64§result_cache_persist_stale_store_skipped_total: u64§result_cache_persist_errors_total: u64§result_cache_persist_shutdown_abandoned_total: u64§result_cache_persist_queue_depth: u64§result_cache_persist_unavailable_total: u64

Number of times persistent publication transitioned to unavailable (worker spawn failure, worker shutdown, queue unavailable).

§result_cache_persist_skipped_total: u64

Number of query-path persist operations skipped because publication was unavailable (the in-memory entry is kept; nothing hits disk).

§result_cache_worker_spawn_failures_total: u64

Number of background-worker spawn / I/O-setup failures.

§result_cache_worker_shutdown_total: u64

Number of background-worker shutdowns while the cache was live.

§hot_fallback_reasons: [u64; 9]§hot_fallback_overlay_versions_total: u64§hot_fallback_runs_considered_total: u64§hot_fallback_runs_opened_total: u64§hot_fallback_pages_decoded_total: u64§hot_fallback_rows_materialized_total: u64§hot_lookup_duration_nanos: u64§hot_fallback_duration_nanos: u64§hot_mapping_rebuild_total: u64§hot_checkpoint_rejected_total: u64

Trait Implementations§

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impl Clone for LookupMetricsSnapshot

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fn clone(&self) -> LookupMetricsSnapshot

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Copy for LookupMetricsSnapshot

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impl Debug for LookupMetricsSnapshot

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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 LookupMetricsSnapshot

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fn default() -> LookupMetricsSnapshot

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

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impl PartialEq for LookupMetricsSnapshot

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fn eq(&self, other: &LookupMetricsSnapshot) -> bool

Equality operator ==. Read more
1.0.0 (const: unstable) · Source§

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=. Read more
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impl StructuralPartialEq for LookupMetricsSnapshot

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🔬This is a nightly-only experimental API. (clone_to_uninit)
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