hazelcast web session replication doesn't replicate when shutdown

[bilalyasar]

full story is here: https://groups.google.com/forum/#!topic/hazelcast/H1FWmMgBdz4
when server goes to shutdown, our architecture couldn't get whether this process is shutdown or timeout.
so in some cases replication doesn't work.

    @Test
    public void test() throws Exception {
        CookieStore cookieStore = new BasicCookieStore();
        executeRequest("write", serverPort1, cookieStore);
        server1.restart();
        assertEquals("value",executeRequest("read", serverPort2, cookieStore));
    }

[serkan-ozal]

The issue is caused by destroying session.

When the session on server1 is destroyed, its entries (key and values) are removed from distributed map via "DestroySessionEntryProcessor" and "InvalidateSessionAttributesEntryProcessor" processor in "destroySession" method. So the second one cannot find it in both of its local map (since it is not requested from server2 before server1 is restarted) and in distributed map.

https://github.com/hazelcast/hazelcast/blob/master/hazelcast-wm/src/main/java/com/hazelcast/web/WebFilter.java#L363

[eladh]

Hi.

Our Software update procedure includes Current / New Tomcat servers .
When deploying new Software update we shutting down one of the servers - but its graceful shutdown and not by sending kill signal to the process.

Any workaround for this issue / or fix estimation ?

thanks,
elad.

[mesutcelik]

What you can do for now is :

• block all incoming requests to one Tomcat instance i.e. configuring load balancer
• wait until all sessions are expired or migrated to the other Tomcat instance.
• upgrade Tomcat server and restart
• configure load balancer to direct requests to the new server.
• redo the same operations to all the other Tomcat instances.

[mesutcelik]

fixed by #7112