postgres-xc-general Mailing List for Postgres-XC

Hi, Koichi-san,

> Could you open bug tickets in sourceforge and assign them to me?

ID: 3612883

Rgds,

Hisada

> -----Original Message-----
> From: 鈴木 幸市 [mailto:ko...@in...]
> Sent: Wednesday, May 01, 2013 9:51 AM
> To: Masaki HISADA
> Cc: pos...@li...
> Subject: Re: [Postgres-xc-general] GTM standby behaivor when cannot
connect
> with GTM active
> 
> I have also observed connection error message in gtm slave although
there're
> no network failure and gtm master is running.   We should look into it.
> 
> Also failure to stop gtm standby could be a bug.
> 
> Could you open bug tickets in sourceforge and assign them to me?
> ---
> Koichi Suzuki
> 
> 
> 
> On 2013/04/30, at 16:04, Masaki HISADA <his...@la...>
wrote:
> 
> > Hi Kohichi-san,
> >
> >
> >> At present, gtm_standby does not use tcp_keepalives.    Gtm_standby
just
> > wait
> >> for GTM to send backups and does not detect network fault until the
> >> kernel timeout (usually 60min or so).
> >
> > From gtm.log, it seems that gtm_standby detecting connection failure
> > with GTM about 1 minute after starting up gtm_standby.
> >
> >>> $ less gtm/data/gtm.log
> >>> 1:140357722076928:2013-02-25 04:38:23.850 JST -LOG:  Connecting the
> >>> GTM active on 192.168.2.1:19000...
> >>> LOCATION:  gtm_standby_connectToActiveGTM, gtm_standby.c:511
> >>> 1:140357722076928:2013-02-25 04:39:26.856 JST -FATAL:  Failed to
> >>> establish a connection to active-GTM.
> >>> LOCATION:  main, main.c:553
> >
> >> Because it continues to wait for incoming backup commands, status
> >> will
> > return
> >> that it's running.   If Gtm slave starts during the network fault, it
> > cannot
> >> get initial response from master and it will fail.
> >
> > I have tried stop immediate in this situation but could not stop
> > gtm_standby but cannot stop gtm_standby ....
> > Although gtm_standby is waiting for GTM backup, I guess gtm_standby
> > needs to be shutting down when immediate shutdown.
> >
> >> (4) Stop gtm_stadby
> >
> > $ gtm_ctl -D gtm/data/ -Z gtm start
> > server starting
> > $ gtm_ctl -D gtm/data/ -Z gtm stop -m immediate waiting for server to
> > shut down................
> > ............................................... failed
> > gtm_ctl: server does not shut down
> >
> > Regards,
> >
> > Mark
> >
> >
> >> Regards;
> >> ---
> >> Koichi Suzuki
> >>
> >>
> >>
> >> On 2013/04/26, at 16:00, Masaki HISADA <his...@la...>
> > wrote:
> >>
> >>> Hi,
> >>>
> >>> I have been testing pgxc behavior when network between gtm and
> >>> gtm_standy has down.
> >>>
> >>> I have started up gtm_standby and linked down bw gtm and gtm_standby
> >>> by using iptables. I expected that gtm_standby would fail with error
> >>> because gtm_standby cannot establish synchronization with gtm active.
> >>>
> >>> Problem :
> >>> 1. gtm_standby started without error response although gtm_standby
> >>> has failed to establish connection with gtm active from gtm.log. Is
> >>> gtm alive or not?
> >>> 2. Assuming gtm alive I have tried immediate stop to gtm_standby but
> > failed.
> >>> 3. Checking at gtm status, it is stopped.
> >>>
> >>> Question
> >>> (1) Am I testing right?
> >>> (2) Is this expected behavior for gtm_standby when it cannot
> >>> establish connection with gtm?
> >>>
> >>> Test procedure as follows;
> >>>
> >>> (1) Start up GTM active at Server A
> >>> $ gtm_ctl -D gtm/data/ -Z gtm status
> >>>
> >>> (2) Network down (simulated with setting iptables) $ iptables -I
> >>> INPUT -i bond1 -j DROP $ iptables -I OUTPUT -o bond1 -j DROP
> >>>
> >>> (3) Start up GTM standby at Server B $ gtm_ctl -D gtm/data/ -Z gtm
> >>> start server starting
> >>>
> >>> (4) Stop gtm_stadby
> >>> waiting for server to shut down................
> >>> ............................................... failed
> >>> gtm_ctl: server does not shut down
> >>>
> >>> (5) Check status
> >>> $ gtm_ctl -D gtm/data/ -Z gtm status
> >>> gtm_ctl: no server running
> >>> $ ps aux | grep gtm | grep -v grep
> >>> # No output
> >>> $ ll gtm/data/
> >>> 合計 12
> >>> -rw------- 1 pgxc pgxc 2217  2月 15 06:15 2013 gtm.conf
> >>> -rw------- 1 pgxc pgxc 295  2月 25 04:39 2013 gtm.log
> >>> -rw------- 1 pgxc pgxc 45  2月 25 04:38 2013 gtm.pid
> >>>
> >>> $ less gtm/data/gtm.log
> >>> 1:140357722076928:2013-02-25 04:38:23.850 JST -LOG:  Connecting the
> >>> GTM active on 192.168.2.1:19000...
> >>> LOCATION:  gtm_standby_connectToActiveGTM, gtm_standby.c:511
> >>> 1:140357722076928:2013-02-25 04:39:26.856 JST -FATAL:  Failed to
> >>> establish a connection to active-GTM.
> >>> LOCATION:  main, main.c:553
> >>>
> >>> pos...@li...
> >>>
> >>> Tested Version : commitID(3f15aef4ed3f8b2014d42bce3ed75650c4db907d)
> >>>
> >>> Rgds,
> >>>
> >>> Mark
> >>>
> >>>
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