FLUME-3348：TailDirSource will write an empty position when#313

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Commits on Dec 20, 2019

If an exception occurs while FileWriter writing to the file, whereafter call FileWriter close method ,the file will be cleared. This is FileWriter characteristic.
felix-thinkingdata
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Commits on Dec 26, 2019

Update TaildirSource.java
felix-thinkingdata
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