60e9b2bdd5
## What changes were proposed in this pull request?
```DStreams
class FileInputDStream
[line 162] protected[streaming] override def clearMetadata(time: Time) {
batchTimeToSelectedFiles.synchronized {
val oldFiles = batchTimeToSelectedFiles.filter(_._1 < (time - rememberDuration))
batchTimeToSelectedFiles --= oldFiles.keys
```
The above code does not remove the old generatedRDDs. "super.clearMetadata(time)" was added to the beginning of clearMetadata to remove the old generatedRDDs.
## How was this patch tested?
At the end of clearMetadata, the testing code (print the number of generatedRDDs) was added to check the old RDDS were removed manually.
Author: shaofei007 <1427357147@qq.com>
Author: Fei Shao <1427357147@qq.com>
Closes #18718 from shaofei007/master.
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