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https://issues.apache.org/jira/browse/HDFS-15618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17211046#comment-17211046
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Ahmed Hussein commented on HDFS-15618:
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I added a configuration key {{dfs.block.scanner.volume.join.timeout.ms}} that
controls the duration the thread times out waiting to join on a
{{VolumeScanner}} thread. This value is only used within
{{BlockScanner.removeAllVolumeScanners()}}.
This parameter can be used to switch between "fast mode" vs "slow mode".
A small value guarantees that the {{Datanode}} will proceed to shutdown without
waiting for the {{VolumeScanner}} to finish.
> 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
>
>
> 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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