Struct TimeseriesToning 

pub struct TimeseriesToning {
    pub memtable_budget_bytes: usize,
    pub memtable_hard_limit_bytes: usize,
    pub max_tag_cardinality: u32,
    pub total_budget_bytes: usize,
    pub block_size: usize,
    pub cagg_fold_partitions_per_tick: usize,
    pub merge_groups_per_tick: usize,
    pub merge_max_rows: u64,
    pub merge_quiet_ms: u64,
}

Timeseries engine tuning (memtable budgets, block sizes).

Fields

memtable_budget_bytes: usize

Soft memtable budget: reaching it schedules a flush at the next record boundary. Rows already in the memtable are never refused because of it.

memtable_hard_limit_bytes: usize

Hard memtable ceiling. Reaching it forces a flush BEFORE the next WAL record is ingested, never partway through one: by the time the Data Plane sees a record its WAL append has already committed, so the memtable must take the record whole or the write is silently lost. Consequently a single record can carry the memtable up to its own decoded size past this ceiling; see the admission gate in the timeseries ingest handler for the bound that costs.

max_tag_cardinality: u32

Maximum distinct values per symbol (tag / string) column in one memtable generation. Flushing resets the dictionaries, so this bounds dictionary size between flushes rather than over the collection’s life.

total_budget_bytes: usize

block_size: usize

cagg_fold_partitions_per_tick: usize

Sealed partitions one maintenance tick reads to fold into continuous aggregates. Bounds the time a tick holds the core while an aggregate backfills after a CREATE or a restart.

merge_groups_per_tick: usize

Partition groups one maintenance tick merges. Late rows flush into a new partition beside the one their interval already has; a merge combines the partitions of one interval into one.

merge_max_rows: u64

Most rows one merge reads and writes. Bounds the memory a merge holds. A larger interval merges in several groups.

merge_quiet_ms: u64

How long after an interval ends its partitions merge. Late rows for an interval still arriving within this window flush first, so the interval merges once.

Trait Implementations

impl Clone for TimeseriesToning

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TimeseriesToning

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for TimeseriesToning

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for TimeseriesToning

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for TimeseriesToning

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.