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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