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https://issues.apache.org/jira/browse/HDFS-4426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13560106#comment-13560106
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Daryn Sharp commented on HDFS-4426:
-----------------------------------
The 2NN creates a daemon thread of itself and implicitly relies on other
threads to keep the process alive - is this a case of two wrongs make a right?
Or is there a technical reason why the 2NN shouldn't simply do it's work in the
main thread?
> Secondary namenode shuts down immediately after startup
> -------------------------------------------------------
>
> Key: HDFS-4426
> URL: https://issues.apache.org/jira/browse/HDFS-4426
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.0.3-alpha, 0.23.6
> Reporter: Jason Lowe
> Assignee: Arpit Agarwal
> Priority: Blocker
>
> After HADOOP-9181 went in, the secondary namenode immediately shuts down
> after it is started. From the startup logs:
> {noformat}
> 2013-01-22 19:54:28,826 INFO namenode.SecondaryNameNode
> (SecondaryNameNode.java:initialize(299)) - Checkpoint Period :3600 secs (60
> min)
> 2013-01-22 19:54:28,826 INFO namenode.SecondaryNameNode
> (SecondaryNameNode.java:initialize(301)) - Log Size Trigger :40000 txns
> 2013-01-22 19:54:28,845 INFO namenode.SecondaryNameNode
> (StringUtils.java:run(616)) - SHUTDOWN_MSG:
> /************************************************************
> SHUTDOWN_MSG: Shutting down SecondaryNameNode at xx
> ************************************************************/
> {noformat}
> I looked into the issue, and it's shutting down because
> SecondaryNameNode.main starts a bunch of daemon threads then returns. With
> nothing but daemon threads remaining, the JVM sees no reason to keep going
> and proceeds to shutdown. Apparently we were implicitly relying on the fact
> that the HttpServer QueuedThreadPool threads were not daemon threads to keep
> the secondary namenode process up.
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