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https://issues.apache.org/jira/browse/HDFS-8681?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Junping Du updated HDFS-8681:
-----------------------------
    Fix Version/s: 2.8.0

> BlockScanner is incorrectly disabled by default
> -----------------------------------------------
>
>                 Key: HDFS-8681
>                 URL: https://issues.apache.org/jira/browse/HDFS-8681
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 2.7.0
>            Reporter: Andrew Wang
>            Assignee: Arpit Agarwal
>            Priority: Blocker
>             Fix For: 2.8.0, 2.7.1, 3.0.0-alpha1
>
>         Attachments: HDFS-8681.01.patch, HDFS-8681.02.patch, 
> HDFS-8681.03.patch, HDFS-8681.04.patch
>
>
> This code is used to check whether the block scanner is enabled:
> {noformat}
>   public boolean isEnabled() {
>     return (conf.scanPeriodMs) > 0 && (conf.targetBytesPerSec > 0);
>   }
> {noformat}
> Unfortunately, when this was introduced, we did not change the default scan 
> period's value of 0, which means by default the BlockScanner is disabled.



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