chuanjie.duan created HDFS-15658:
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Summary: Improve datanode capability balancing
Key: HDFS-15658
URL: https://issues.apache.org/jira/browse/HDFS-15658
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs
Reporter: chuanjie.duan
How about adjust the order of choosing replication to deletion?
Is there any other meaning, choosing "oldestHeartbeatStorage" first?
public DatanodeStorageInfo chooseReplicaToDelete(
Collection<DatanodeStorageInfo> moreThanOne,
Collection<DatanodeStorageInfo> exactlyOne,
final List<StorageType> excessTypes,
Map<String, List<DatanodeStorageInfo>> rackMap) {
......
final DatanodeStorageInfo storage;
if (minSpaceStorage != null) {
storage = minSpaceStorage;
} else if (oldestHeartbeatStorage != null) {
storage = oldestHeartbeatStorage;
} else {
return null;
}
excessTypes.remove(storage.getStorageType());
return storage;
}
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