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https://issues.apache.org/jira/browse/HDFS-16450?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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yanbin.zhang reopened HDFS-16450:
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> 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
> Priority: Major
> Attachments: HDFS-16450.001.patch
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> 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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