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https://issues.apache.org/jira/browse/HDFS-15618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HDFS-15618 started by Ahmed Hussein.
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> Improve datanode shutdown latency
> ---------------------------------
>
>                 Key: HDFS-15618
>                 URL: https://issues.apache.org/jira/browse/HDFS-15618
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>            Reporter: Ahmed Hussein
>            Assignee: Ahmed Hussein
>            Priority: Major
>             Fix For: 3.2.2, 3.3.1, 3.4.0, 3.2.3
>
>         Attachments: HDFS-15618-branch-3.3.004.patch, HDFS-15618.001.patch, 
> HDFS-15618.002.patch, HDFS-15618.003.patch, HDFS-15618.004.patch
>
>
> The shutdown of Datanode is a very long latency. A block scanner waits for 5 
> minutes to join on each VolumeScanner thread.
> Since the scanners are daemon threads and do not alter the block content, it 
> is safe to ignore such conditions on shutdown of Datanode.



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