1:18 a.m.
Following is a list of issues I saw when playing with Beta4 on Windows.
Apologies if some of these are known issues / already fixed. I'll scan
JIRA now and open issues for any I don't see.
1) Undeploy an app or shut down server, clients with an existing session
do not fail over. Following from access_log shows the issue. Last 404
occurs a couple seconds after the REMOVE-APP, so doesn't seem to be a race.
192.168.2.3 - - [16/Mar/2009:16:07:48 +0100] "STOP-APP /
HTTP/1.0" 200 -
127.0.0.1 - - [16/Mar/2009:16:07:48 +0100] "GET /load-demo/record HTTP/1.1" 503
1086
127.0.0.1 - - [16/Mar/2009:16:07:48 +0100] "GET /load-demo/record HTTP/1.1" 503
1086
127.0.0.1 - - [16/Mar/2009:16:07:48 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:48 +0100] "GET /load-demo/record HTTP/1.1" 503
1086
127.0.0.1 - - [16/Mar/2009:16:07:48 +0100] "GET /load-demo/record HTTP/1.1" 503
1086
127.0.0.1 - - [16/Mar/2009:16:07:48 +0100] "GET /load-demo/record HTTP/1.1" 503
1086
192.168.2.3 - - [16/Mar/2009:16:07:48 +0100] "REMOVE-APP / HTTP/1.0" 200 -
192.168.2.3 - - [16/Mar/2009:16:07:48 +0100] "STATUS / HTTP/1.0" 200 59
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 404
999
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 404
999
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 404
999
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 404
999
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 404
999
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 404
999
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record?destroy=true
HTTP/1.1" 200 21
127.0.0.1 - - [16/Mar/2009:16:07:49 +0100] "GET /load-demo/record HTTP/1.1" 404
999
192.168.2.3 - - [16/Mar/2009:16:07:49 +0100] "STATUS / HTTP/1.0" 200 59
192.168.2.3 - - [16/Mar/2009:16:07:50 +0100] "STATUS / HTTP/1.0" 200 59
127.0.0.1 - - [16/Mar/2009:16:07:51 +0100] "GET /load-demo/record HTTP/1.1" 404
999
127.0.0.1 - - [16/Mar/2009:16:07:51 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:51 +0100] "GET /load-demo/record?destroy=true
HTTP/1.1" 200 21
127.0.0.1 - - [16/Mar/2009:16:07:51 +0100] "GET /load-demo/record HTTP/1.1" 404
999
127.0.0.1 - - [16/Mar/2009:16:07:51 +0100] "GET /load-demo/record HTTP/1.1" 404
999
127.0.0.1 - - [16/Mar/2009:16:07:51 +0100] "GET /load-demo/record HTTP/1.1" 404
999
127.0.0.1 - - [16/Mar/2009:16:07:51 +0100] "GET /load-demo/record HTTP/1.1" 404
999
127.0.0.1 - - [16/Mar/2009:16:07:51 +0100] "GET /load-demo/record HTTP/1.1" 404
999
127.0.0.1 - - [16/Mar/2009:16:07:51 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:51 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:51 +0100] "GET /load-demo/record HTTP/1.1" 404
999
127.0.0.1 - - [16/Mar/2009:16:07:51 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:51 +0100] "GET /load-demo/record HTTP/1.1" 200
21
127.0.0.1 - - [16/Mar/2009:16:07:51 +0100] "GET /load-demo/record HTTP/1.1" 404
999
127.0.0.1 - - [16/Mar/2009:16:07:51 +0100] "GET /load-demo/record HTTP/1.1" 404
999
2) When you run with HAModClusterService, every 10 seconds there is
logging about a DRM replicantsChanged event and a new HASingletonMaster
election. (The election just picks the existing master.) That means the
DRM is being updated even when nothing has changed, which shouldn't happen.
3) To get advertise to work, I had to add a AdvertiseGroup
224.0.1.105:23364 directive to httpd.conf. The docs on jboss.org imply
that shouldn't be necessary since the value is just the default.
4) The mod_cluster-manager status page reports Transfered: 0, Connected:
0, Load: 0 Num sessions: 0 for all nodes, always; doesn't ever report
actual data. Also "Transfered" should be "Transferred"
5) The mod_cluster-manager status page "SessionIDs" section lists
session ids, which is a security violation. Jean-Frederic, you mentioned
you wanted to remove this. In case you haven't, I tried to disable it by
setting Maxsessionid 0 in httpd.conf, but that had no effect.
6) Playing with the demo's "Server Load Control" tab I tried to use the
"Heap Memory Use" control. I couldn't get this to have any effect on
load balancing.
a) The servlet isn't multiplying the duration value by 1000 to convert
seconds to ms. I'll fix this in just a sec after I send this.
b) but, even after adjusting for this I couldn't get any load balancing
effect by using "Heap Memory Use". Looking at the process in Task
Manager, it seemed the servlet was increasing heap usage. So I'm
concerned there is an issue with the load metric.
7) Go into jmx-console, jboss.web:service=ModClusterService, invoke the
"disable" operation. Node logs this in server.log:
009-03-16 17:15:58,765 ERROR
[org.jboss.modcluster.mcmp.impl.DefaultMCMPHandler]
(http-192.168.2.2-8080-2) Error [null: null: {4}] sending command DUMP
to proxy 192.168.2.3:6666, configuration will be reset
2009-03-16 17:16:55,250 ERROR
[org.jboss.modcluster.mcmp.impl.DefaultMCMPHandler]
(http-192.168.2.2-8080-2) Error [null: null: {4}] sending command
DISABLE-APP to proxy 192.168.2.3:6666, configuration will be reset
--
Brian Stansberry
Lead, AS Clustering
JBoss, a division of Red Hat
brian.stansberry(a)redhat.com