Add an interface for DataBlockScanner logging
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Key: HDFS-3056
URL: https://issues.apache.org/jira/browse/HDFS-3056
Project: Hadoop HDFS
Issue Type: Improvement
Components: data-node
Reporter: Tsz Wo (Nicholas), SZE
Assignee: Tsz Wo (Nicholas), SZE
Some methods in the FSDatasetInterface are used only for logging in
DataBlockScanner. These methods should be separated out to an new interface.
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