[MAPREDUCE-6822] should set HADOOP_JOB_HISTORYSERVER_HEAPSIZE only if it's empty on branch2

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.9.0
• Fix Version/s: 2.9.0
• Component/s: scripts
• Target Version/s: 2.9.0
• Assignee: Hui Fei
• Reporter: Hui Fei
• Created: 13/Dec/16 02:45
• Updated: 10/Sep/20 12:20
• Resolved: 13/Dec/16 21:10

Description

In mapred-env, set HADOOP_JOB_HISTORYSERVER_HEAPSIZE 1000 by default, That is incorrect.
We should set it 1000 by default only if it's empty.
Because if you run 'HADOOP_JOB_HISTORYSERVER_HEAPSIZE =512 $HADOOP_HOME/sbin/mr-jobhistory-daemon.sh start historyserver', HADOOP_JOB_HISTORYSERVER_HEAPSIZE will be set 1000, rather than 512.