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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12102) VolumeScanner throttle dropped (fast scan enabled) when there is a corrupt block
Date Fri, 04 Aug 2017 22:49:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16115059#comment-16115059

Arpit Agarwal commented on HDFS-12102:

Hi [~nroberts], we've seen single drive failures usually manifest as IO slowness or failing
IOs (of course occasionally a drive becomes completely unresponsive).

The proposal makes sense for your failure mode. Also if multiple blocks on a disk become corrupt
in a single scan cycle then we could mark it as a failed volume. Just curious, when you see
this, what fraction of blocks on the disk appear corrupt? I assume the blocks become unreadable
and you don't actually read corrupted data. 

> 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, HDFS-12102-003.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

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