Review Request 59743: FLUME-3101. When TaildirSource read the file written by high frequency, would not break out to read another file.

[hun shenshi]

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Review request for Flume.


Bugs: FLUME-3101
    https://issues.apache.org/jira/browse/FLUME-3101


Repository: flume-git


Description
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Add a threshold in TaildirSource. Use the threshold to control the number of 
reads when a file is written by high frequency.


Diffs
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flume-ng-sources/flume-taildir-source/src/main/java/org/apache/flume/source/taildir/TaildirSource.java
 a107a01 


Diff: https://reviews.apache.org/r/59743/diff/1/


Testing
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mvn clean install -DskipTests -> built


Thanks,

hun shenshi