[HADOOP-8928] Add ability to reset topologies on master nodes

• Type: Improvement
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.0.2-alpha, 3.0.0-alpha1
• Component/s: net
• Labels: BB2015-05-TBR
• Assignee: Unassigned
• Reporter: Shinichi Yamashita
• Created: 14/Oct/12 15:03
• Updated: 14/Oct/16 16:53

Description

For a topology decision of DataNode and TaskTracker, ScriptBasedMapping (probably TableMapping) confirms HashMap first.
To decide topology of DataNode and TaskTracker again, it is necessary to restart NameNode and JobTracker.
Therefore, it is necessary to change (or clear) HashMap function without restarting NameNode and JobTracker.

Issue Links

• depends upon: HADOOP-8231 Make topologies easier to set up and debug
• is depended upon by: HADOOP-8629 Add option for TableMapping to reload mapping file on match failure