Use generic type to declare FSDatasetInterface
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Key: HDFS-3021
URL: https://issues.apache.org/jira/browse/HDFS-3021
Project: Hadoop HDFS
Issue Type: Improvement
Components: data-node
Reporter: Tsz Wo (Nicholas), SZE
Assignee: Tsz Wo (Nicholas), SZE
Currently we have to cast FSVolumeInterface to FSVolume in FSDataset. Using
generic type could avoid it.
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