Hadoop 2.6.2 Release Notes

• YARN-4101. Critical sub-task reported by Yesha Vora and fixed by Xuan Gong (yarn)
  RM should print alert messages if Zookeeper and Resourcemanager gets connection issue
  

• YARN-4092. Major sub-task reported by Xuan Gong and fixed by Xuan Gong (resourcemanager)
  RM HA UI redirection needs to be fixed when both RMs are in standby mode
  

• YARN-4087. Major bug reported by Jian He and fixed by Jian He
  Followup fixes after YARN-2019 regarding RM behavior when state-store error occurs
  

• YARN-4005. Major bug reported by Jun Gong and fixed by Jun Gong
  Completed container whose app is finished is not removed from NMStateStore
  

• YARN-3896. Major bug reported by Jun Gong and fixed by Jun Gong (resourcemanager)
  RMNode transitioned from RUNNING to REBOOTED because its response id had not been reset synchronously
  

• YARN-3802. Major bug reported by zhihai xu and fixed by zhihai xu (resourcemanager)
  Two RMNodes for the same NodeId are used in RM sometimes after NM is reconnected.
  

• YARN-3798. Blocker bug reported by Bibin A Chundatt and fixed by Varun Saxena (resourcemanager)
  ZKRMStateStore shouldn't create new session without occurrance of SESSIONEXPIED
  

• YARN-3780. Minor bug reported by zhihai xu and fixed by zhihai xu (resourcemanager)
  Should use equals when compare Resource in RMNodeImpl#ReconnectNodeTransition
  

• YARN-3727. Major improvement reported by zhihai xu and fixed by zhihai xu (nodemanager)
  For better error recovery, check if the directory exists before using it for localization.
  

• YARN-3554. Major bug reported by Jason Lowe and fixed by Naganarasimha G R
  Default value for maximum nodemanager connect wait time is too high
  

• YARN-3194. Blocker bug reported by Rohith Sharma K S and fixed by Rohith Sharma K S (resourcemanager)
  RM should handle NMContainerStatuses sent by NM while registering if NM is Reconnected node
  

• YARN-2019. Critical bug reported by Junping Du and fixed by Jian He
  Retrospect on decision of making RM crashed if any exception throw in ZKRMStateStore
  

• MAPREDUCE-6497. Major bug reported by Shinichi Yamashita and fixed by Shinichi Yamashita
  Fix wrong value of JOB_FINISHED event in JobHistoryEventHandler
  

• MAPREDUCE-6454. Critical bug reported by Junping Du and fixed by Junping Du
  MapReduce doesn't set the HADOOP_CLASSPATH for jar lib in distributed cache.
  

• MAPREDUCE-6334. Blocker bug reported by Eric Payne and fixed by Eric Payne
  Fetcher#copyMapOutput is leaking usedMemory upon IOException during InMemoryMapOutput shuffle handler