yuanboliu opened a new pull request, #4233:
URL: https://github.com/apache/hadoop/pull/4233
…ime.
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### Description of PR
IBR opeeration is seperated from heartbeat thread since
[HDFS-16016](https://issues.apache.org/jira/browse/HDFS-16016), which is great.
But IBR thread is using the expireTime of heart beat to deside whether wait
or not. In a high load DataNode, IBR thread becomes an infinit loop without
sleeping and consuming 100% cpu because of the latency of heartbeat reporting.
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