Hey guys,
I have a pipeline that generates two different types of data (but both use
the same trait) and I need to save each on a different sink.
So far, things were working with splits, but it seems using splits with
side outputs (for the late data, which we'll plug a late arrival handling)
causes errors, so I changed everything to side outputs.
To select a side output based on type, I did the following:
class MetricTypeSplitter(accountingTag:OutputTag[Metric],
analysingTag:OutputTag[Metric]) extends ProcessFunction[Metric, Metric] {
val logger = LoggerFactory.getLogger(this.getClass)
override def processElement(
value:Metric,
ctx:ProcessFunction[Metric, Metric]#Context,
out:Collector[Metric]
): Unit = {
out.collect(value)
value match {
case record:AccountingMetric => {
logger.info(s"Sending ${record} to Accounting")
ctx.output(accountingTag, record)
}
case record:AnalysingMetric => {
logger.info(s"Sending ${record} to Analysis")
ctx.output(analysingTag, record)
}
case _ => {
logger.error(s"Don't know the type of ${value}")
}
}
}
}
And at the end of the pipeline I add the splitter:
pipeline
.process(new MetricTypeSplitter(accountTag, analysisTag))
So far, this works and I can see the logs of which tag each metric in being
sent being generated. The second part, in which I capture the side output
and send the data to sink, doesn't seem to work, though:
pipeline
.getSideOutput(accountTag)
.map { tuple => AccountingSink.toRow(tuple) }.name("Accounting rows")
.writeUsingOutputFormat(accountingSink.output).name(s"${accountingSink}")
And here is the problem: It seems .getSideOutput() is never actually
getting the side output because a the logger in AccoutingSink.toRow() is
never happening and the data is not showing on our database (toRow()
convers the Metric to a Row and accountingSInk.output returns the
JDBCOutputFormat).
Any ideas what I need to do for side outputs to be actually captured?
--
*Julio Biason*, Sofware Engineer
*AZION* | Deliver. Accelerate. Protect.
Office: +55 51 3083 8101 <callto:+555130838101> | Mobile: +55 51
<callto:+5551996209291>*99907 0554*
