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feat: expose list read-dir amplification metrics (#5103)

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Record local read_dir entry counts and duration for live-walker ListObjects scans so wide root/prefix amplification can be measured below the cross-set merge layer.

Add a focused LocalDisk scan_dir test showing a page limit of one still observes the whole parent directory enumeration, plus metric helper coverage.

Co-authored-by: heihutu <heihutu@gmail.com>
This commit is contained in:
houseme
2026-07-22 08:15:41 +08:00
committed by GitHub
parent 9469dfa5b8
commit a8e7cce5e1
4 changed files with 223 additions and 5 deletions
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crates/io-metrics/src/lib.rs
+6 -4
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@@ -210,10 +210,12 @@ pub use io_metrics::{
record_io_scheduler_decision, record_load_level_change, record_queue_operation, record_starvation_event,
};
pub use list_objects_metrics::{
LIST_OBJECTS_GATHER_OUTCOME_INPUT_CLOSED, LIST_OBJECTS_GATHER_OUTCOME_LIMIT_REACHED, LIST_OBJECTS_SOURCE_WALKER,
ListObjectsGatherObservation, ListObjectsIndexPageObservation, init_list_objects_metrics, record_list_objects_gather,
record_list_objects_index_attempt, record_list_objects_index_fallback, record_list_objects_index_live_verify_failure,
record_list_objects_index_served, record_list_objects_merge,
LIST_OBJECTS_GATHER_OUTCOME_INPUT_CLOSED, LIST_OBJECTS_GATHER_OUTCOME_LIMIT_REACHED,
LIST_OBJECTS_LOCAL_READ_DIR_OUTCOME_ERROR, LIST_OBJECTS_LOCAL_READ_DIR_OUTCOME_OK, LIST_OBJECTS_SOURCE_WALKER,
ListObjectsGatherObservation, ListObjectsIndexPageObservation, ListObjectsLocalReadDirObservation, init_list_objects_metrics,
record_list_objects_gather, record_list_objects_index_attempt, record_list_objects_index_fallback,
record_list_objects_index_live_verify_failure, record_list_objects_index_served, record_list_objects_local_read_dir,
record_list_objects_merge,
};
// Backpressure metrics exports