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https://issues.apache.org/jira/browse/HDFS-7666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14292273#comment-14292273
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Colin Patrick McCabe commented on HDFS-7666:
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Hi Rakesh,
I'm not sure why we would want the blockID upgrade threads to be daemon
threads. Daemon threads don't block the JVM from exiting if they are the only
remaining threads. But we don't expect the JVM to while an upgrade is still
incomplete. In fact, if it does, we are in big trouble.
> Datanode blockId layout upgrade threads should be daemon thread
> ---------------------------------------------------------------
>
> Key: HDFS-7666
> URL: https://issues.apache.org/jira/browse/HDFS-7666
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Rakesh R
> Assignee: Rakesh R
> Attachments: HDFS-7666-v1.patch
>
>
> This jira is to mark the layout upgrade thread as daemon thread.
> {code}
> int numLinkWorkers = datanode.getConf().getInt(
> DFSConfigKeys.DFS_DATANODE_BLOCK_ID_LAYOUT_UPGRADE_THREADS_KEY,
> DFSConfigKeys.DFS_DATANODE_BLOCK_ID_LAYOUT_UPGRADE_THREADS);
> ExecutorService linkWorkers =
> Executors.newFixedThreadPool(numLinkWorkers);
> {code}
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