Arpit Agarwal created HDFS-5232:
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Summary: Protocol changes to transmit StorageUuid
Key: HDFS-5232
URL: https://issues.apache.org/jira/browse/HDFS-5232
Project: Hadoop HDFS
Issue Type: Sub-task
Components: datanode, hdfs-client, namenode
Affects Versions: Heterogeneous Storage (HDFS-2832)
Reporter: Arpit Agarwal
Assignee: Arpit Agarwal
Currently the StorageID is used to identify both the Datanode and the storage.
This works because we treat all storages attached to the Datanode as a single
storage unit.
We plan to replace the StorageID with two independent IDs:
# Datanode UUID - this will be a string that uniquely identifies each Datanode
in the cluster. For upgraded clusters, the Datanode UUID will be the StorageID
prior to the upgrade.
# Storage UUID - Each storage attached to the datanode will be identified by a
UUID.
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