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https://issues.apache.org/jira/browse/CASSANDRA-1718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12980795#action_12980795
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Jonathan Ellis commented on CASSANDRA-1718:
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bq. Is there some way to tell the JVM to put its detritus elsewhere?
http://www.oracle.com/technetwork/java/javase/tech/vmoptions-jsp-140102.html
lists -XX:HeapDumpPath but nothing for a JVM crash log that I see.
> cassandra should chdir / when daemonizing
> -----------------------------------------
>
> Key: CASSANDRA-1718
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1718
> Project: Cassandra
> Issue Type: Bug
> Components: Packaging
> Environment: Debian squeeze, Cassandra 0.7.0-beta3 and trunk
> (r1032649)
> Reporter: paul cannon
> Assignee: Eric Evans
> Priority: Minor
> Fix For: 0.7.1
>
> Attachments:
> v1-0001-CASSANDRA-1718-switch-to-home-directory-on-startup.txt
>
>
> Common practice when daemonizing is to cd / to avoid pinning a filesystem.
> For example, if the oper happens to start Cassandra (by itself, or with a
> manual jsvc invocation, or with the initscript) in /mnt/usb-storage, and
> there is something mounted there, then the oper will not be able to unmount
> the usb device that was mounted at that location, since the cassandra process
> has it open as its cwd.
> evidence that this isn't being done already:
> {noformat}
> ~% sudo lsof -p 9775 | awk '$4=="cwd"'
> jsvc 9775 cassandra cwd DIR 8,1 4096 147675
> /home/paul/packages/cassandra/trunk
> {noformat}
> (That instance was invoked using the Debian initscript.)
> Obviously chdir("/") isn't necessary when not daemonizing, although it
> shouldn't hurt either.
> If there are concerns about Cassandra having an ongoing ability to open
> filenames relative to its original working directory, then it should be
> sufficient just to do a "cd /" in the initscript before starting Cassandra.
> That case, at least, is particularly important.
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