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head | Juttle Language Reference

head

Only emit the first limit points from each batch.

head limit [by groupfield1, [groupfield2, ...]]
Parameter Description Required?
limit The number of points to emit; may be an expression that evaluates to an integer No; defaults to 1
by One or more fields by which to group. See Grouping fields with by. No

Example: Generate batches containing ten points each but only log the first two points from each batch

{!docs/examples/processors/head_batch_live.juttle!}