LiuGuH opened a new pull request, #5888:
URL: https://github.com/apache/hadoop/pull/5888
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### Description of PR
After [HDFS-16016](https://issues.apache.org/jira/browse/HDFS-16016) , it
makes ibr in a thread to avoid heartbeat blocking with ibr when require
readlock in Datanode.
Now fbr should do as this. The reason is this:
(1)heartbeat maybe block because of fbr with readlock in datanode
(2)fbr will only may return FinalizeCommand
### How was this patch tested?
### For code changes:
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