[mod_cluster-issues] [JBoss JIRA] (MODCLUSTER-359) stickysession not working with httpd-2.4.6 / mod_cluster-1.2.5.Final

[Marco Danti (JIRA)]

     [ https://issues.jboss.org/browse/MODCLUSTER-359?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Marco Danti updated MODCLUSTER-359:
-----------------------------------

    Fix Version/s:     (was: 1.3.0.Alpha1)
                       (was: 1.2.6.Final)
      Description: 
Setup: HTTPD configured as reverse proxy / load balancer for two instances of JBOSS-AS-7.2.0.Final running in HA configuration on two separate nodes.

In the following configuration (defined inside my virtual hosts), the stickysession directive worked as expected using httpd-2.2.24/mod_cluster-1.2.0.Final.
 
<Proxy balancer://mycluster>
  BalancerMember ajp://stw-1:7009/ route=stw-1
  BalancerMember ajp://stw-2:7009/ route=stw-2
  ProxySet stickysession=JSESSIONID|jsessionid
</Proxy>

After upgrading to httpd-2.4.6/mod_cluster-1.2.5.Final however, it does not work any longer and this is what happens:

- if the 'BalancerMember' directives are omitted, then 'stickysession' is  
  ignored and any client request gets dispatched alternatively to each one of 
  the two JBoss servers (exactly as if lbmethod=byrequest were defined)

- if the 'BalancerMember' directives are left in place, then the httpd server 
  generates a segment fault in mod_proxy_cluster.c, in function
  "internal_find_best_byrequests" when attempting to access the variable 
  'helper' (defined as 'proxy_cluster_helper *helper') because the line

   helper = (proxy_cluster_helper *) worker->context;

  results in helper == NULL.


As a final consideration, I read in the docs that stickysession should be enabled by default in mod_cluster anyway, but that is not the case for me.



  was:
Setup: HTTPD configured as reverse proxy / load balancer for two instances of JBOSS-AS-7.2.0.Final on separate nodes.

In the following configuration (defined inside my virtual hosts), the stickysession directive worked as expected using httpd-2.2.24/mod_cluster-1.2.0.Final.
 
<Proxy balancer://mycluster>
  BalancerMember ajp://stw-1:7009/ route=stw-1
  BalancerMember ajp://stw-2:7009/ route=stw-2
  ProxySet stickysession=JSESSIONID|jsessionid
</Proxy>

After upgrading to httpd-2.4.6/mod_cluster-1.2.5.Final however, it does not work any longer: 'stickysession' is ignored, and any request gets dispatched alternatively to each one of my two JBOSS-AS-7.2.0 instances running in HA mode on two different nodes (exactly as if lbmethod=byrequest were defined)

I read in the docs that stickysession should be enabled by default in mod_cluster anyway, but that is not the case for me.

Please note that I get the same problem either with or without the two BalancerMember directives.



    
> stickysession not working with httpd-2.4.6 / mod_cluster-1.2.5.Final
> --------------------------------------------------------------------
>
>                 Key: MODCLUSTER-359
>                 URL: https://issues.jboss.org/browse/MODCLUSTER-359
>             Project: mod_cluster
>          Issue Type: Bug
>    Affects Versions: 1.2.5.Final
>         Environment: OS. SLES-11-SP1 x86_64
>            Reporter: Marco Danti
>            Assignee: Jean-Frederic Clere
>              Labels: httpd, mod_cluster, stickysession
>
> Setup: HTTPD configured as reverse proxy / load balancer for two instances of JBOSS-AS-7.2.0.Final running in HA configuration on two separate nodes.
> In the following configuration (defined inside my virtual hosts), the stickysession directive worked as expected using httpd-2.2.24/mod_cluster-1.2.0.Final.
>  
> <Proxy balancer://mycluster>
>   BalancerMember ajp://stw-1:7009/ route=stw-1
>   BalancerMember ajp://stw-2:7009/ route=stw-2
>   ProxySet stickysession=JSESSIONID|jsessionid
> </Proxy>
> After upgrading to httpd-2.4.6/mod_cluster-1.2.5.Final however, it does not work any longer and this is what happens:
> - if the 'BalancerMember' directives are omitted, then 'stickysession' is  
>   ignored and any client request gets dispatched alternatively to each one of 
>   the two JBoss servers (exactly as if lbmethod=byrequest were defined)
> - if the 'BalancerMember' directives are left in place, then the httpd server 
>   generates a segment fault in mod_proxy_cluster.c, in function
>   "internal_find_best_byrequests" when attempting to access the variable 
>   'helper' (defined as 'proxy_cluster_helper *helper') because the line
>    helper = (proxy_cluster_helper *) worker->context;
>   results in helper == NULL.
> As a final consideration, I read in the docs that stickysession should be enabled by default in mod_cluster anyway, but that is not the case for me.

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