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https://issues.apache.org/jira/browse/HDFS-3512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13696266#comment-13696266
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Uma Maheswara Rao G commented on HDFS-3512:
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@Amith, This is intentional from the code. If there are many blocks then it
will give some random number. So, scan should happen with that period time
anyway. So, I am not seeing big issue here. do you agree?
> Delay in scanning blocks at DN side when there are huge number of blocks
> ------------------------------------------------------------------------
>
> Key: HDFS-3512
> URL: https://issues.apache.org/jira/browse/HDFS-3512
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.0.0-alpha
> Reporter: suja s
> Assignee: amith
> Attachments: HDFS-3512.patch
>
>
> Block scanner maintains the full list of blocks at DN side in a map and there
> is no differentiation between the blocks which are already scanned and the
> ones not scanend. For every check (ie every 5 secs) it will pick one block
> and scan. There are chances that it chooses a block which is already scanned
> which leads to further delay in scanning of blcoks which are yet to be
> scanned.
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