[HADOOP-2764] specify different heap size for namenode/jobtracker vs. tasktracker/datanodes

• Type: New Feature
• Status: Closed
• Priority: Minor
• Resolution: Duplicate
• Affects Version/s: 0.15.3
• Assignee: Unassigned
• Reporter: Joydeep Sen Sarma
• Created: 01/Feb/08 09:26
• Updated: 08/Feb/08 23:32
• Resolved: 01/Feb/08 18:25

Description

tasktrackers/datanodes should be run with low memory settings. theres a lot of competition for memory on slave nodes and these tasks don't need much memory anyway and best to keep heap setting low.

namenode needs higher memory and there's usually lots to spare on separate box.

hadoop-env.sh can provide different heap settings for central vs. slave daemons.