Hi Steve,
When you call env.readFile(…), internally env creates:
ContinuousFileMonitoringFunction<OUT>
monitoringFunction =
new
ContinuousFileMonitoringFunction<>(inputFormat,
monitoringMode,
getParallelism(),
interval);
ContinuousFileReaderOperator<OUT>
reader =
new
ContinuousFileReaderOperator<>(inputFormat);
SingleOutputStreamOperator<OUT>
source = addSource(monitoringFunction,
sourceName)
.transform("Split Reader: "
+ sourceName,
typeInfo,
reader);
return new DataStreamSource<>(source);
ContinuousFileMonitoringFunction is RichSource function (not parallel), so it has parallelism 1.
On each execution (controlled by monitor parameter), it builds recursive tree of all new file splits which are passed to ContinuousFileReaderOperator.
ContinuousFileReaderOperator in parallel process each filesplit.
From: Steve Whelan <[hidden email]>
Date: Tuesday, 11 August 2020 at 04:48
To: user <[hidden email]>
Subject: S3 file source parallelism reverting to 1
Hi,
I have an S3 file source being consumed as FileProcessingMode.PROCESS_CONTINUOUSLY with a parallelism of 3. I can confirm the parallelism is set by printing it out. However, in the UI, the file source has a parallelism of 1. I'm not changing
it after its being initially set.
DataStream s = env.readFile(
new JsonInputFormat(...),
filePath,
FileProcessingMode.PROCESS_CONTINUOUSLY,
5,
myTypeInformation)
.setParallelism(3);
System.out.println(s.getParallelism()); // prints 3
The DataStreamSource is a parallel operator otherwise `setParallelism(3)` would throw an `IllegalArgumentException`[1]. The only other thing I do with the DataStream is register it with the TableEnvironment.
tableEnvironment.registerDataStream("my_table", dataStream);
Is Flink resetting it to 1 for some reason? I'm running v1.9.0.
Thanks,
Steve
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