[jira] [Created] (HDFS-16450) Give priority to releasing DNs with less free space

["yanbin.zhang (Jira)" <ji...@apache.org>]

yanbin.zhang created HDFS-16450:
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             Summary: Give priority to releasing DNs with less free space
                 Key: HDFS-16450
                 URL: https://issues.apache.org/jira/browse/HDFS-16450
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs
    Affects Versions: 3.3.0
            Reporter: yanbin.zhang
            Assignee: yanbin.zhang


When deleting redundant replicas, the one with the least free space should be prioritized.
{code:java}
//BlockPlacementPolicyDefault#chooseReplicaToDelete

final DatanodeStorageInfo storage;
if (oldestHeartbeatStorage != null) {
  storage = oldestHeartbeatStorage;
} else if (minSpaceStorage != null) {
  storage = minSpaceStorage;
} else {
  return null;
}
excessTypes.remove(storage.getStorageType());
return storage; {code}
Change the above logic to the following:
{code:java}
//BlockPlacementPolicyDefault#chooseReplicaToDelete
final DatanodeStorageInfo storage;
if (minSpaceStorage != null) {
  storage = minSpaceStorage;
} else if (oldestHeartbeatStorage != null) {
  storage = oldestHeartbeatStorage;
} else {
  return null;
} {code}



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