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Re: Ozone should exit cleanly upon control-C
Jan, can you please keep this in the list? Thanks.
On Tue, 27 Mar 2001, Jan van Oort wrote:
> Anyway, I reproduced the phenomenon on my Solaris/intel box. The exception thrown is the
> following one:
>
> bash-2.03$ ozone -ddata
> ozone server - version 0.6.1
> initializing environment...
> ozoneDB.adminPort = 3000
> ozoneDB.classicStore.clusterSize = 65536
> ozoneDB.classicStore.clusterSpaceSize = 5120000
> ozoneDB.classicStore.tableBufferSize = 12800
> ozoneDB.classicStore.tableCacheSize = 4096
> ozoneDB.dbID = 0
> ozoneDB.fileLog = INFO, WARN, ERROR
> ozoneDB.port = 3333
> ozoneDB.stdoutLog = INFO, WARN, ERROR
> ozoneDB.store = org.ozoneDB.core.wizardStore.WizardStore
> ozoneDB.wizardStore.clusterSize = 65536
> ozoneDB.wizardStore.clusterSizeRatio = 256
> ozoneDB.wizardStore.compressClusters = true
> ozoneDB.wizardStore.tableBufferSize = 15
> ozoneDB.wizardStore.tableCacheSize = 12
> ozoneDB.wizardStore.tableSubtableSize = 11
> Unable to initialize server.
> java.io.FileNotFoundException: data/log (Permission denied)
> at java.io.FileOutputStream.open(Native Method)
> at java.io.FileOutputStream.<init>(FileOutputStream.java:102)
> at java.io.FileOutputStream.<init>(Compiled Code)
> at org.ozoneDB.core.Env.initLogs(Compiled Code)
> at org.ozoneDB.core.Env.<init>(Env.java:174)
> at org.ozoneDB.core.Server.main(Compiled Code)
>
> There is very clearly NO permission problem, contrarily to what the exception says, as I
> always run as the same user, and the first time the server runs fine... but maybe I am
> doing something wrong somewhere else ?
Does data/log exists? Which access rights does it have? And what content?
Falko
>
> Falko Braeutigam wrote:
>
> > On Mon, 26 Mar 2001, Jan van Oort wrote:
> > > Falko Braeutigam wrote:
> > >
> > > > On Mon, 26 Mar 2001, Jan van Oort wrote:
> > > > > I have noticed that datafile corruption may occur when an ozone Server
> > > > > instance is aborted brutally (for example, by doing control-C, or by
> > > > > doing kill -STOP <ozone_process_number> on Unix).
> > > >
> > > > A server abort (regardless of its level of brutality) should not cause any
> > > > datafile corruption. The small timeframe between begin and end of commit of
> > > > update transactions (excluding prepare-commit) is to only real dangorous spot.
> > > > What did you do to corrupt files? Can you recreate this?
> > > >
> > >
> > > Yes, I can recreate this. With ozone-0.6.1 On Solaris for x86/Intel:
> > > - build with ant
> > > - run ozoneInst -d/test/data (test is a mountpoint for a newly created filesystem
> > > on a very recently formatted, brand-new Fujitsu disk); everything goes fine
> > > - run ozone with the "&" sign at the end of the bash command line (as I want to
> > > re-use that terminal for occasional things like sar or vmstat to see system
> > > health) on this newly created database
> > > - run the AdminClient in order to create a user, and exit cleanly from AdminClient
> > >
> > > - with ps -ef get the ozone process number (e.g. 10014)
> > > - then "kill -STOP 10014"
> > > - then re-start ozone; I get a message (forgot the exact trace, it happened last
> > > nigth, I can send you the exact trace tomorrow morning) something like 'data file
> > > not found' or 'bad data file', and ozone exits.
> >
> > -STOP does not actually kill the process and so the port is not released which
> > will cause the next ozone server that starts to throw an "unable to bind"
> > exception. However, -SIGSEGV is for sure the most brutal abort. But it causes
> > no problems on my linux based ozone server.
> >
> > Falko
> >
> > >
> > >
> > > >
> > > > >
> > > > > Is it possible to implement Runtime.addShutdownHook( Thread _hook) ?
> > > > > This method is available in the JDK1.3 only. It enables the JVM to exit
> > > > > cleanly in case of such "unclean" process abortion.
> > > >
> > > > Not all users have a 1.3 JVM. Some time ago some users tried to come up with a
> > > > JVM independent solution. Unfortunately they did not get too far.
> > > >
> > >
> > > We tried the same thing for our piece of software under JDK 1.2.x; we never got
> > > something like a ShutdownHook working before JDK 1.3
> > >
> > > Anyway, I'll create a shutdown hook, test it thoroughly, then send it to you. You
> > > see what you do with it. I will use it anyway, as my installer also installs the
> > > JVM.
> > >
> > > >
> > > > Falko
> > > >
> > > > >
> > > > > I will fist try it on my own machine (Solaris 8 on Intel), will then
> > > > > report back.
> > > > >
> > > > > --
> > > > > Jan van Oort
> > > > >
> > > > >
> > > > > Database Fire Fighter
> > > > --
> > > > ______________________________________________________________________
> > > > Falko Braeutigam mailto:falko@smb-tec.com
> > > > SMB GmbH http://www.smb-tec.com
> > >
> > > --
> > > Jan van Oort
> > >
> > >
> > > Database Fire Fighter
> > --
> > ______________________________________________________________________
> > Falko Braeutigam mailto:falko@smb-tec.com
> > SMB GmbH http://www.smb-tec.com
>
> --
> Jan van Oort
>
>
> Database Fire Fighter
--
______________________________________________________________________
Falko Braeutigam mailto:falko@smb-tec.com
SMB GmbH http://www.smb-tec.com