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Attributes

Classes

spark_expectations.sinks.plugins.kafka_writer.SparkExpectationsKafkaWritePluginImpl

Bases: SparkExpectationsSinkWriter

class helps to write the stats data into the NSP

Functions

writer(_write_args: Dict[Union[str], Union[str, bool, Dict[str, str], DataFrame]]) -> None

The functions helps to write data into the kafka topic

Parameters:

Name Type Description Default
_write_args Dict[Union[str], Union[str, bool, Dict[str, str], DataFrame]]
required
Source code in spark_expectations/sinks/plugins/kafka_writer.py 
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@spark_expectations_writer_impl
def writer(
    self, _write_args: Dict[Union[str], Union[str, bool, Dict[str, str], DataFrame]]
) -> None:
    """
    The functions helps to write data into the kafka topic
    Args:
        _write_args:

    Returns:

    """

    try:
        # kafka_options = {
        #     "kafka.bootstrap.servers": "localhost:9092",
        #     "topic": _write_args.get("nsp_topic_name"),
        #     "failOnDataLoss": "true",
        # }

        if _write_args.pop("enable_se_streaming"):
            _log.info("started write stats data into nsp stats topic")

            df: DataFrame = _write_args.get("stats_df")

            df.selectExpr("to_json(struct(*)) AS value").write.format("kafka").mode(
                "append"
            ).options(**_write_args.get("kafka_write_options")).save()

            _log.info("ended writing stats data into nsp stats topic")

    except Exception as e:
        raise SparkExpectationsMiscException(
            f"error occurred while saving data into NSP {e}"
        )