[GitHub] [flume] felix-thinkingdata opened a new pull request #313: FLUME-3348：TailDirSource will write an empty position when

[GitBox]

felix-thinkingdata opened a new pull request #313: FLUME-3348：TailDirSource 
will write an empty position when
URL: https://github.com/apache/flume/pull/313
 
 
   When the number of files exceeds the maximum number of files allowed by the 
system.
   
   taildirSource throw Exception:
   
   java.io.FileNotFoundException: position/taildir_position.json (Too many open 
files)
   
![image](https://user-images.githubusercontent.com/59079269/71471031-2b084380-2809-11ea-8093-9ba425e026b3.png)
   the reason:
   
   If an exception occurs while FileWriter writing to the file, whereafter call 
FileWriter close method ,the file will be cleared. This is FileWriter 
characteristic.
   
![image](https://user-images.githubusercontent.com/59079269/71471036-35c2d880-2809-11ea-85d8-0370e2810a72.png)
   

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