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From <cost...@covalent.net>
Subject Re: AW: cvs commit: jakarta-tomcat-connectors/jk/java/org/apache/jk/common Shm.java
Date Thu, 02 May 2002 14:40:08 GMT
On Thu, 2 May 2002, Hans Schmid wrote:

> We have two Tomcats in a lb group. Only one is running at a time with
> lbfactor=1,
> the other has lbfactor=0 assinged but is not running -> all requests go to
> TC1
> 
> When we upgrade our system we update the classes/jars and start the second
> Tomcat TC2 in the group,
> switch the lbfactor of TC1 to 0 and the lbfactor fo TC2 to 1 and do a
> graceful
> restart of apache. This way old sessions still go to TC1 whereas new
> sessions go to TC2.

That's exactly what I'm trying to do :-)
( almost - if on the same machine, TC1 going up will automatically add it
to the lb group, and eventually if a TC is detected to go down, it'll be 
automatically removed )

Costin


> 
> After all sessions on TC1 have ended, we shutdown TC1 and TC2 serves
> everything.
> 
> Next update goes in the oposit direction (start TC1, switch lbfactors, wait
> for the end of all
> sessions on TC2 and finally shutdown TC2.
> 
> 
> Thanks,
> Hans
> 
> 
> 
> >   Still to add:
> >   - display ( nicely ) the information in the shm
> >   - read info from shm ( like slots owned by apache processes with
> >   statistics - in a future release )
> >
> >   Revision  Changes    Path
> >   1.9       +27 -0
> > jakarta-tomcat-connectors/jk/java/org/apache/jk/common/Shm.java
> >
> >   Index: Shm.java
> >   ===================================================================
> >   RCS file:
> > /home/cvs/jakarta-tomcat-connectors/jk/java/org/apache/jk/common/S
> > hm.java,v
> >   retrieving revision 1.8
> >   retrieving revision 1.9
> >   diff -u -r1.8 -r1.9
> >   --- Shm.java	1 May 2002 22:40:17 -0000	1.8
> >   +++ Shm.java	2 May 2002 03:18:01 -0000	1.9
> >   @@ -95,6 +95,7 @@
> >
> >        boolean unregister=false;
> >        boolean reset=false;
> >   +    String dumpFile=null;
> >
> >        // Will be dynamic ( getMethodId() ) after things are stable
> >        static final int SHM_SET_ATTRIBUTE=0;
> >   @@ -102,6 +103,8 @@
> >        static final int SHM_ATTACH=3;
> >        static final int SHM_DETACH=4;
> >        static final int SHM_RESET=5;
> >   +    static final int SHM_DUMP=6;
> >   +    static final int SHM_DESTROY=7;
> >
> >        public Shm() {
> >        }
> >   @@ -112,6 +115,13 @@
> >            file=f;
> >        }
> >
> >   +    /** Copy the scoreboard in a file for debugging
> >   +     *  Will also log a lot of information about what's in the
> > scoreboard.
> >   +     */
> >   +    public void setDump( String dumpFile ) {
> >   +        this.dumpFile=dumpFile;
> >   +    }
> >   +
> >        /** Size. Used only if the scoreboard is to be created.
> >         */
> >        public void setSize( int size ) {
> >   @@ -199,6 +209,20 @@
> >            this.invoke( msg, mCtx );
> >        }
> >
> >   +    public void dumpScoreboard(String fname) throws IOException {
> >   +        if( apr==null ) return;
> >   +        MsgContext mCtx=createMsgContext();
> >   +        Msg msg=(Msg)mCtx.getMsg(0);
> >   +        C2BConverter c2b=(C2BConverter)mCtx.getNote(C2B_NOTE);
> >   +        msg.reset();
> >   +
> >   +        msg.appendByte( SHM_DUMP );
> >   +
> >   +        appendString( msg, fname, c2b);
> >   +
> >   +        this.invoke( msg, mCtx );
> >   +    }
> >   +
> >        public void setNativeAttribute(String name, String val)
> > throws IOException {
> >            if( apr==null ) return;
> >            MsgContext mCtx=createMsgContext();
> >   @@ -315,8 +339,11 @@
> >                    return;
> >                }
> >                init();
> >   +
> >                if( reset ) {
> >                    resetScoreboard();
> >   +            } else if( dumpFile!=null ) {
> >   +                dumpScoreboard(dumpFile);
> >                } else if( unregister ) {
> >                    unRegisterTomcat( host, port );
> >                } else {
> >
> >
> >
> >
> > --
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> >
> >
> 
> 
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> 


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