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https://issues.apache.org/jira/browse/HDFS-854?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmytro Molkov updated HDFS-854:
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Attachment: HDFS-854.patch.1
Added a shutdown to DirectoryScanner to close the thread pool on exit.
> Datanode should scan devices in parallel to generate block report
> -----------------------------------------------------------------
>
> Key: HDFS-854
> URL: https://issues.apache.org/jira/browse/HDFS-854
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Affects Versions: 0.22.0
> Reporter: dhruba borthakur
> Assignee: Dmytro Molkov
> Fix For: 0.22.0
>
> Attachments: HDFS-854.patch, HDFS-854.patch.1
>
>
> A Datanode should scan its disk devices in parallel so that the time to
> generate a block report is reduced. This will reduce the startup time of a
> cluster.
> A datanode has 12 disk (each of 1 TB) to store HDFS blocks. There is a total
> of 150K blocks on these 12 disks. It takes the datanode upto 20 minutes to
> scan these devices to generate the first block report.
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