Struct QueryIoProbes 

pub struct QueryIoProbes {
    pub manifest_wrapper: Option<Arc<dyn WrappingObjectStore>>,
    pub commit_graph_wrapper: Option<Arc<dyn WrappingObjectStore>>,
    pub table_wrapper: Option<Arc<dyn WrappingObjectStore>>,
    pub probe_count: Arc<AtomicU64>,
    pub data_open_count: Arc<AtomicU64>,
    pub internal_open_count: Arc<AtomicU64>,
}

Per-query IO probes, installed for a query’s task via with_query_io_probes.

Each wrapper is attached (when present) to the datasets that category opens, so a test reads read_iops off its own IOTracker handle. probe_count records calls to the version probe (which runs on the coordinator’s already-open handle, so it is counted by invocation rather than by the per-query wrappers).

Fields

manifest_wrapper: Option<Arc<dyn WrappingObjectStore>>

commit_graph_wrapper: Option<Arc<dyn WrappingObjectStore>>

table_wrapper: Option<Arc<dyn WrappingObjectStore>>

Attached to the per-table data opens a query performs (the cache-miss path in SubTableEntry::open). Lets a cost test assert how many tables a query actually opened — N on a cold read, 0 on a warm repeat once the handle cache (Fix 3) serves them.

probe_count: Arc<AtomicU64>

data_open_count: Arc<AtomicU64>

Counts DATA-table open CALLS through the two instrumented chokepoints (open_dataset_tracked / open_table_dataset), classified by URI so the internal/system tables (__manifest, _graph_commits*) are EXCLUDED — the publisher CAS and commit-graph append open those every write, and counting them would make the data_open_count <= |touched_tables| write gate (RFC-013 step 3b) unreachable by threading alone. Unlike the opener-read term (which mixes with the merge-insert/RI scan on the write path), this is an exact open-invocation count. forbidden_apis keeps engine code OUTSIDE the storage layer (exec/, db/omnigraph/, loader/, changes/) from opening datasets except through these chokepoints, so the count is complete for the keyed-write data path the gate measures. (table_store.rs is allow-listed and does hold direct Dataset::opens — but only for branch-management ops (delete_branch/list_branches/force_delete_branch), never that hot path.)

internal_open_count: Arc<AtomicU64>

Internal/system-table (__manifest, _graph_commits*) open CALLS — the complement of data_open_count, kept for symmetry and debugging.

Trait Implementations

impl Clone for QueryIoProbes

fn clone(&self) -> QueryIoProbes

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Default for QueryIoProbes

fn default() -> QueryIoProbes

Returns the “default value” for a type.