Struct datafusion::physical_plan::metrics::BaselineMetrics

pub struct BaselineMetrics { /* private fields */ }

Helper for creating and tracking common “baseline” metrics for each operator

Example:

use datafusion::physical_plan::metrics::{BaselineMetrics, ExecutionPlanMetricsSet};
let metrics = ExecutionPlanMetricsSet::new();

let partition = 2;
let baseline_metrics = BaselineMetrics::new(&metrics, partition);

// during execution, in CPU intensive operation:
let timer = baseline_metrics.elapsed_compute().timer();
// .. do CPU intensive work
timer.done();

// when operator is finished:
baseline_metrics.done();

Implementations

impl BaselineMetrics

pub fn new(metrics: &ExecutionPlanMetricsSet, partition: usize) -> Self

Create a new BaselineMetric structure, and set start_time to now

pub fn intermediate(&self) -> BaselineMetrics

Returns a BaselineMetrics that updates the same elapsed_compute ignoring all other metrics

This is useful when an operator offloads some of its intermediate work to separate tasks that as a result won’t be recorded by Self::record_poll

pub fn elapsed_compute(&self) -> &Time

return the metric for cpu time spend in this operator

pub fn output_rows(&self) -> &Count

return the metric for the total number of output rows produced

pub fn done(&self)

Records the fact that this operator’s execution is complete (recording the end_time metric).

Note care should be taken to call done() manually if BaselineMetrics is not dropped immediately upon operator completion, as async streams may not be dropped immediately depending on the consumer.

pub fn record_output(&self, num_rows: usize)

Record that some number of rows have been produced as output

See the RecordOutput for conveniently recording record batch output for other thing

pub fn try_done(&self)

If not previously recorded done(), record

pub fn record_poll( &self, poll: Poll<Option<Result<RecordBatch>>> ) -> Poll<Option<Result<RecordBatch>>>

Process a poll result of a stream producing output for an operator, recording the output rows and stream done time and returning the same poll result

Trait Implementations

impl Clone for BaselineMetrics

fn clone(&self) -> BaselineMetrics

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for BaselineMetrics

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

Formats the value using the given formatter.

impl Drop for BaselineMetrics

fn drop(&mut self)

Executes the destructor for this type.