Is this a syslogd error?

Hemant Bist hemant_bist at yahoo.com
Tue Sep 4 06:51:03 UTC 2007


Hi,
Thanks for replying.
I confirmed that the mogilefsd crashes if I stop the syslogd. (And mogilefsd
would not even start till I start the syslogd daemon.)
Just adding  setlogsock('udp'); to MogileFS/Server.pm does not seem to be
helping.

However I have version 0.09 of Sys::Syslog. I will try with  the newer
version on CPAN that has a 'nofatal' option to not croak.
Thanx,
HB
=============log from my machine ============
hbist at bestprice:~/work/bestprice/doc$ date; ps -ef |grep mogilefsd
Mon Sep  3 23:21:26 PDT 2007
mogile   25409     1 11 23:20 ?        00:00:03 mogilefsd
mogile   25410 25409 22 23:20 ?        00:00:06 mogilefsd [replicate]
mogile   25411 25409  0 23:20 ?        00:00:00 mogilefsd [delete]
mogile   25412 25409  4 23:20 ?        00:00:01 mogilefsd [queryworker]
mogile   25413 25409  4 23:20 ?        00:00:01 mogilefsd [queryworker]
mogile   25414 25409  4 23:20 ?        00:00:01 mogilefsd [queryworker]
mogile   25415 25409  1 23:20 ?        00:00:00 mogilefsd [monitor]
mogile   25416 25409  0 23:20 ?        00:00:00 mogilefsd [reaper]
mogile   25417 25409  0 23:20 ?        00:00:00 mogilefsd [fsck]
hbist    25451 31128  0 23:21 pts/4    00:00:00 grep mogilefsd
hbist at bestprice:~/work/bestprice/doc$ sudo /etc/init.d/sysklogd stop
 * Stopping system
log...
[ ok ]
hbist at bestprice:~/work/bestprice/doc$ #wait for few seconds
hbist at bestprice:~/work/bestprice/doc$ date; ps -ef |grep mogilefsd
Mon Sep  3 23:22:29 PDT 2007
hbist    25526 31128  0 23:22 pts/4    00:00:00 grep mogilefsd
hbist at bestprice:~/work/bestprice/doc$ #try starting mogilefsd with syslogd
stopped.
hbist at bestprice:~/work/bestprice/doc$ sudo -u mogile mogilefsd -c
/etc/mogilefs/mogilefsd.conf --daemon
hbist at bestprice:~/work/bestprice/doc$ date; ps -ef |grep mogilefsd
Mon Sep  3 23:23:09 PDT 2007
hbist    25570 31128  0 23:23 pts/4    00:00:00 grep mogilefsd
hbist at bestprice:~/work/bestprice/doc$ sudo /etc/init.d/sysklogd start
 * Starting system
log...
[ ok ]
hbist at bestprice:~/work/bestprice/doc$ #try starting mogilefsd with syslogd
running
hbist at bestprice:~/work/bestprice/doc$ sudo -u mogile mogilefsd -c
/etc/mogilefs/mogilefsd.conf --daemon
hbist at bestprice:~/work/bestprice/doc$ #try starting mogilefsd with syslogd
running
hbist at bestprice:~/work/bestprice/doc$ date; ps -ef |grep mogilefsd
Mon Sep  3 23:23:51 PDT 2007
mogile   25613     1  9 23:23 ?        00:00:01 mogilefsd
mogile   25614 25613 38 23:23 ?        00:00:06 mogilefsd [replicate]
mogile   25615 25613  0 23:23 ?        00:00:00 mogilefsd [delete]
mogile   25616 25613  0 23:23 ?        00:00:00 mogilefsd [queryworker]
mogile   25617 25613  0 23:23 ?        00:00:00 mogilefsd [queryworker]
mogile   25618 25613  0 23:23 ?        00:00:00 mogilefsd [queryworker]
mogile   25619 25613  1 23:23 ?        00:00:00 mogilefsd [monitor]
mogile   25620 25613  0 23:23 ?        00:00:00 mogilefsd [reaper]
mogile   25621 25613  0 23:23 ?        00:00:00 mogilefsd [fsck]
hbist    25643 31128  0 23:23 pts/4    00:00:00 grep mogilefsd
hbist at bestprice:~/work/bestprice/doc$ clear
hbist at bestprice:~/work/bestprice/doc$

##
ep  3 23:21:39 localhost exiting on signal 15
Sep  3 23:23:15 localhost syslogd 1.4.1#17ubuntu7: restart.
##
On 9/3/07, dormando <dormando at rydia.net> wrote:
>
> Hemant Bist wrote:
> > Hi,
> > I am testing mogilefs on  a single machine on ubunutu dapper. I ran a
> > script that apparently 'crashed' mogilefsd after few hours.
> > Around the time when mogilefsd crashed, I see the following
> > error.(syslog file was rotated around this time). To me it looks like
> > that syslogd rotation caused mogilefsd to crash.
> > Am I correct in my conclusion? Is there some setting I can use to avoid
> > this?
> >
> > (line 262 in .../MogileFS/Server.pm is 262 is   Sys::Syslog::syslog(@_);
> )
> >
>
> (I could be wrong; just took two minutes to look at this).
>
> `perldoc Sys::Syslog` says that error happens when syslog couldn't talk
> over reliable connection. I'm assuming you have syslogd logging to
> localfiles on the same machine as the mogilefs tracker.
>
> A quick fix might be adding "setlogsock('udp');" above the Server.pm
> line with Sys::Syslog::openlog in it.
>
> Should be an easy test if you can manually stop syslogd and cause the
> mogile tracker to crash.
>
> It could be a while before I personally could test this condition and
> suggest a patch, but if someone else wants to it's really easy.
>
> -Dormando
>
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