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https://issues.apache.org/jira/browse/HDFS-15618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17214754#comment-17214754
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Ahmed Hussein commented on HDFS-15618:
--------------------------------------

I will try to set it is a smaller value. Last thing I tried was 500ms and that 
caused some Junits to fail.
since the production configurations can be set a small value (5 seconds), I 
will try to investigate all the affected JUnits to see if something can be done 
to fix that.

> 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
>         Attachments: HDFS-15618.001.patch, HDFS-15618.002.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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