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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