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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7254) NPE on startup if another Cassandra instance is already running
Date Wed, 25 Jun 2014 22:42:24 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14044146#comment-14044146
] 

Brandon Williams commented on CASSANDRA-7254:
---------------------------------------------

I thought we could take a simple approach of looking for an existing Cassandra process, but
even that won't work because we'll break CCM and people who run multiple instances per node.
We can't really rely on the pidfile either because of foreground mode. Trapping stderr in
the shell is difficult because at that point we're calling exec.

We could have a small java program that tries to bind the ports and exits non-zero if it can't,
then print out a message saying we couldn't bind before trying to start cassandra.

> NPE on startup if another Cassandra instance is already running
> ---------------------------------------------------------------
>
>                 Key: CASSANDRA-7254
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7254
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Tyler Hobbs
>            Assignee: Chris Lohfink
>            Priority: Minor
>             Fix For: 2.1.0
>
>
> After CASSANDRA-7087, if you try to start cassandra while another instance is already
running, you'll see something like this:
> {noformat}
> $ bin/cassandra -f
> Error: Exception thrown by the agent : java.lang.NullPointerException
> {noformat}
> This is probably a JVM bug, but we should confirm that, open a JVM ticket, and see if
we can give a more useful error message on the C* side.



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