tomscut opened a new pull request #3839:
URL: https://github.com/apache/hadoop/pull/3839


   JIRA: [HDFS-16402](https://issues.apache.org/jira/browse/HDFS-16402).
   
   After reconfig `dfs.datanode.data.dir`, we found that the stats of the 
Namenode Web became negative and there were many NPE in namenode logs. This 
problem has been solved by 
[HDFS-14042](https://issues.apache.org/jira/browse/HDFS-14042).
   
   However, if `HeartbeatManager#updateHeartbeat` and 
`HeartbeatManager#updateLifeline` throw other exceptions, stats errors can also 
occur. We should ensure that `stats.subtract()` and `stats.add()` are 
transactional.


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