ZanderXu opened a new pull request, #4409:
URL: https://github.com/apache/hadoop/pull/4409

   Jira:  [HDFS-16623](https://issues.apache.org/jira/browse/HDFS-16623), fix 
bug to avoid IllegalArgumentException in LifelineSender.
   
   In our production environment, an IllegalArgumentException occurred in the 
LifelineSender at one DataNode which was undergoing GC at that time.
   
   


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