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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4426) Secondary namenode shuts down immediately after startup
Date Wed, 23 Jan 2013 15:46:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13560760#comment-13560760

Daryn Sharp commented on HDFS-4426:

Just out of curiosity, is there benefit to creating a thread and waiting to join on it, versus
not creating a thread and doing the processing 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
>         Attachments: HDFS-4426.patch, HDFS-4426.patch, HDFS-4426.patch
> 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: 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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