FSNamesystem#getRandomDatanode() should not use Replicator to choose a random
datanode
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Key: HADOOP-5163
URL: https://issues.apache.org/jira/browse/HADOOP-5163
Project: Hadoop Core
Issue Type: Improvement
Components: dfs
Reporter: Hairong Kuang
Fix For: 0.21.0
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.
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