hfutatzhanghb opened a new pull request, #7810:
URL: https://github.com/apache/hadoop/pull/7810

   ### Description of PR
   Refer to HDFS-17808.
   
   Recently, we met an EC problem in our production.
   
   User creates an output stream to write ec files.  That output stream writes 
some bytes and will be idle for a long time until data is ready.  If we restart 
our cluster's datanodes to version up,  those applications will  finally fail 
due to not have enough healthy streamers.
   
   This PR try to solve above problem by end block group in advance when we 
already have failed streamers but less than parity number.
   


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