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https://issues.apache.org/jira/browse/HDFS-8681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14603963#comment-14603963
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Arpit Agarwal commented on HDFS-8681:
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bq. we did not change the default scan period's value of 0,
Instead of changing the default can we just change the check to be
{{conf.scanPeriodMs >= 0}}? Is there any part of HDFS-7430 that would be broken
if the scanPeriod is 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
> Affects Versions: 2.7.0
> Reporter: Andrew Wang
> Assignee: Colin Patrick McCabe
> Priority: Blocker
>
> 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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