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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:
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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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