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https://issues.apache.org/jira/browse/HDFS-8681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14604532#comment-14604532
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Jitendra Nath Pandey commented on HDFS-8681:
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I am +1 for restoring the behavior of branch-2.6. There is no point in scanning
the block pools more than once in several days.
> BlockScanner is incorrectly disabled by default
> -----------------------------------------------
>
> Key: HDFS-8681
> URL: https://issues.apache.org/jira/browse/HDFS-8681
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.7.0
> Reporter: Andrew Wang
> Assignee: Colin Patrick McCabe
> Priority: Blocker
> Attachments: HDFS-8681.01.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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