Hadoop 2.6.1 更新說明
   這些更新說明主要是根據開發人員和用戶的不兼容做的一些重大改進
	- . Major bug reported by Jason Lowe and fixed by Jason Lowe (resourcemanager)
 ClientRMService getApplications has high scheduler lock contention
- . Major bug reported by Jian He and fixed by Jian He 
 RM hangs on draining events
- . Critical bug reported by Rohith Sharma K S and fixed by Bibin A Chundatt (resourcemanager)
 AsyncDispatcher may overloaded with RMAppNodeUpdateEvent when Node is connected/disconnected
- . Major improvement reported by Eric Payne and fixed by Eric Payne (timelineserver , yarn)
 Configurably turn off the saving of container info in Generic AHS
- . Blocker bug reported by Varun Saxena and fixed by Varun Saxena (log-aggregation , nodemanager)
 NM fails to read files from full disks which can lead to container logs being lost and other issues