Arpit Agarwal created HDFS-8691:
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             Summary: Cleanup BlockScanner initialization and add test for 
configuration contract
                 Key: HDFS-8691
                 URL: https://issues.apache.org/jira/browse/HDFS-8691
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: datanode, test
            Reporter: Arpit Agarwal


The initialization of the BlockScanner can be simplified by moving out test 
hooks. Tests can be modified to use configuration only.

Also we need an additional test case to verify the behavior with positive, 
negative and zero values of {{dfs.datanode.scan.period.hours}} for 
compatibility.



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