![Steve Loughran](/assets/img/avatar_default.png)
This cherrypicks SemaphoredDelegatingExecutor HADOOP-17450 changes from trunk somehow they didn't get into the main IOStatistics backport to branch-3.3
HDFS-16942. Addendum. Send error to datanode if FBR is rejected due to bad lease (#5478). Contributed by Stephen O'Donnell/
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