LiuGuH opened a new pull request, #7432:
URL: https://github.com/apache/hadoop/pull/7432

   
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   ### Description of PR
   [HDFS-17741](https://issues.apache.org/jira/browse/HDFS-17741)
   
   When create a file with overwrite, the old blocks will not delete 
immediately because these blocks not add into MarkedDeleteQueue.
   
   This will have two consequences
   
   (1)The block will delete when datanode block report comes.
   
     (2)  If the block is in the PendingReconstructionBlocks, it will  be 
timeouted after 300s.
   
    
   ### How was this patch tested?
   Add a test case.
   
   


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