Junping Du created HDFS-3619:
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Summary: isGoodBlockCandidate() in Balancer is not handling
properly if replica factor >3
Key: HDFS-3619
URL: https://issues.apache.org/jira/browse/HDFS-3619
Project: Hadoop HDFS
Issue Type: Bug
Components: balancer
Affects Versions: 2.0.0-alpha, 1.0.0
Reporter: Junping Du
Assignee: Junping Du
Let's assume:
1. replica factor = 4
2. source node in rack 1 has 1st replica, 2nd and 3rd replica are in rack 2,
4th replica in rack3 and target node is in rack3.
So, It should be good for balancer to move replica from source node to target
node but will return "false" in isGoodBlockCandidate(). I think we can fix it
by simply making judgement that at least one replica node (other than source)
is on the different rack of target node.
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