[HADOOP-5163] FSNamesystem#getRandomDatanode() should not use Replicator to choose a random datanode

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Fix Version/s: 0.21.0
• Assignee: Jakob Homan
• Reporter: Hairong Kuang
• Created: 04/Feb/09 00:44
• Updated: 24/Aug/10 20:35
• Resolved: 19/May/09 22:54

Description

Below is the code:
public DatanodeDescriptor getRandomDatanode()

{ return replicator.chooseTarget(1, null, null, 0)[0]; }

Using Replicator to choose a random datanode is an overkill. It is very expensive and unnecessary.