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https://issues.apache.org/jira/browse/HDFS-12102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16080593#comment-16080593
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Ashwin Ramesh commented on HDFS-12102:
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[~nroberts] Added config options, removed unnecessary debug statements, set
fast scan to disabled by default and is now enabled via a boolean in the
config, and removed corruptBlockThreshold.
[~arpitagarwal] The change is a volume scanner feature that starts a continuous
and high bandwidth scan in order to scan a volume much more quickly when
corruption has been determined to be highly likely.
> VolumeScanner throttle dropped (fast scan enabled) when there is a corrupt
> block
> --------------------------------------------------------------------------------
>
> Key: HDFS-12102
> URL: https://issues.apache.org/jira/browse/HDFS-12102
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: datanode, hdfs
> Affects Versions: 2.8.2
> Reporter: Ashwin Ramesh
> Priority: Minor
> Fix For: 2.8.2
>
> Attachments: HDFS-12102-001.patch, HDFS-12102-002.patch
>
>
> When the Volume scanner sees a corrupt block, it restarts the scan and scans
> the blocks at much faster rate with a negligible scan period. This is so that
> it doesn't take 3 weeks to report blocks since a corrupt block means
> increased likelihood that there are more corrupt blocks.
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