guo created HDFS-16355:
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             Summary: Improve block scanner desc
                 Key: HDFS-16355
                 URL: https://issues.apache.org/jira/browse/HDFS-16355
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs
    Affects Versions: 3.3.1
            Reporter: guo


datanode block scanner will be dissbled if 
`dfs.block.scanner.volume.bytes.per.second` is configured less then or equal to 
zero, we can improve the desciption



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