(cherry picked from commit da93cd962c8d19874d09360726628cdde8595a7d) Conflicts: hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/ReadaheadPool.java
(cherry picked from commit da93cd962c8d19874d09360726628cdde8595a7d) Conflicts: hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/ReadaheadPool.java