cassandra should chdir / when daemonizing
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Key: CASSANDRA-1718
URL: https://issues.apache.org/jira/browse/CASSANDRA-1718
Project: Cassandra
Issue Type: Bug
Environment: Debian squeeze, Cassandra 0.7.0-beta3 and trunk (r1032649)
Reporter: paul cannon
Priority: Minor
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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