[
https://issues.apache.org/jira/browse/HADOOP-14855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16159068#comment-16159068
]
Aaron T. Myers commented on HADOOP-14855:
-----------------------------------------
[~aw] - does this ring any bells for you? Any thoughts on how to make this
check more robust?
> Hadoop scripts may errantly believe a daemon is still running, preventing it
> from starting
> ------------------------------------------------------------------------------------------
>
> Key: HADOOP-14855
> URL: https://issues.apache.org/jira/browse/HADOOP-14855
> Project: Hadoop Common
> Issue Type: Bug
> Components: scripts
> Affects Versions: 3.0.0-alpha4
> Reporter: Aaron T. Myers
>
> I encountered a case recently where the NN wouldn't start, with the error
> message "namenode is running as process 16769. Stop it first." In fact the
> NN was not running at all, but rather another long-running process was
> running with this pid.
> It looks to me like our scripts just check to see if _any_ process is running
> with the pid that the NN (or any Hadoop daemon) most recently ran with. This
> is clearly not a fool-proof way of checking to see if a particular type of
> daemon is now running, as some other process could start running with the
> same pid since the daemon in question was previously shut down.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
