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https://issues.apache.org/jira/browse/HDFS-3512?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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amith updated HDFS-3512:
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Attachment: HDFS-3512.patch
Currently we are adding some random time when the block is getting added into
blockInfoSet, this randomization will be for a very short period of time i.e,
till the block is scanned for the first time, after first scan it will update
the exact time of scan so I thought of removing the random and verified the
block scanning for 75K blocks which worked fine.
I tried to write a test for the same but couldn't since I can't determine the
random number generated and added.
@Suja can u just apply the patch and test the same
> 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: data-node
> Affects Versions: 2.0.1-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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