javierluca opened a new pull request #2365:
URL: https://github.com/apache/hbase/pull/2365


   https://issues.apache.org/jira/browse/HBASE-24994
   
   Hedged reads use same thread pool for the original read:
   
https://github.com/apache/hadoop/blob/0b8464d75227fcee2c6e7f2410377b3d53d3d5f8/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSInputStream.java#L1349-L1357
   When the executor is full and rejects the task, it will be executed in 
current thread, increasing this metric:
   
https://github.com/apache/hadoop/blob/0b8464d75227fcee2c6e7f2410377b3d53d3d5f8/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSClient.java#L2913-L2918
   
   I want to expose this metric to HBase since it will be useful to estimate 
the correct  thread pool size.


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