Github user kl0u commented on the issue:
https://github.com/apache/flink/pull/2109
1) If it is to include it, then I would suggest to just replace the
DefaultFilter with that, and probably give some initial patterns for e.g.
hidden files (start with "."). Having two implementations, both serving as
default implementations in different parts of the code it seems a bit confusing.
2) shouldIgnore() assumes we already have the lock and it is applied
entirely within it, so it will not harm to remove it.
3) The method to change is the `createFileInput(FileInputFormat<OUT>
inputFormat, TypeInformation<OUT> typeInfo, String sourceName,
FileProcessingMode watchType, FilePathFilter pathFilter, long interval)` which
creates the `ContinuousFileMonitoringFunction` .
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