github.com/apache/beam/sdks/v2@v2.48.2/python/apache_beam/testing/benchmarks/nexmark/queries/query12.py (about)

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    17  
    18  """
    19  Query 12, How many bids does a user make within a fixed processing time limit
    20  (Not in original suite.)
    21  
    22  Group bids by the same user into processing time windows of window_size_sec.
    23  Emit the count of bids per window.
    24  """
    25  
    26  import apache_beam as beam
    27  from apache_beam.testing.benchmarks.nexmark.queries import nexmark_query_util
    28  from apache_beam.testing.benchmarks.nexmark.queries.nexmark_query_util import ResultNames
    29  from apache_beam.transforms import trigger
    30  from apache_beam.transforms import window
    31  
    32  
    33  def load(events, metadata=None, pipeline_options=None):
    34    return (
    35        events
    36        | nexmark_query_util.JustBids()
    37        | 'query12_extract_bidder' >> beam.Map(lambda bid: bid.bidder)
    38        # windowing with processing time trigger, currently not supported in batch
    39        | beam.WindowInto(
    40            window.GlobalWindows(),
    41            trigger=trigger.Repeatedly(
    42                trigger.AfterProcessingTime(metadata.get('window_size_sec'))),
    43            accumulation_mode=trigger.AccumulationMode.DISCARDING,
    44            allowed_lateness=0)
    45        | 'query12_bid_count' >> beam.combiners.Count.PerElement()
    46        | 'query12_output' >> beam.Map(
    47            lambda t: {
    48                ResultNames.BIDDER_ID: t[0], ResultNames.BID_COUNT: t[1]
    49            }))