[JBoss JIRA] (MODCLUSTER-427) mod_cluster can break stickiness for the first request on new child processes
by RH Bugzilla Integration (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-427?page=com.atlassian.jira.pl... ]
RH Bugzilla Integration commented on MODCLUSTER-427:
----------------------------------------------------
Ivo Studensky <istudens(a)redhat.com> changed the Status of [bug 1136976|https://bugzilla.redhat.com/show_bug.cgi?id=1136976] from NEW to POST
> mod_cluster can break stickiness for the first request on new child processes
> -----------------------------------------------------------------------------
>
> Key: MODCLUSTER-427
> URL: https://issues.jboss.org/browse/MODCLUSTER-427
> Project: mod_cluster
> Issue Type: Bug
> Components: Native (httpd modules)
> Affects Versions: 1.2.9.Final, 1.3.1.Alpha1
> Environment: JBoss EAP 6.3.0
> Reporter: Aaron Ogburn
> Assignee: Jean-Frederic Clere
> Fix For: 1.2.10.Final, 1.3.1.Alpha3
>
>
> mod_cluster can break stickiness for the first request on new child processes. It looks like this occurs specifically when "CreateBalancers 1" is used. Prefork typically makes this much worse as well.
> My debugging showed that the proxy_balancer would exist, but it would essentially be empty in the new child process. find_session_route/find_route_worker would be called as expected, but the for loop in find_route_worker wasn't even doing anything because balancer->workers->nelts was 0. The balancer would then finally be populated in the new child when the first request hits internal_find_best_byrequests and calls update_workers_node.
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[JBoss JIRA] (MODCLUSTER-430) CreateBalancers behave the same with option 0 or 2
by John Jerome (JIRA)
John Jerome created MODCLUSTER-430:
--------------------------------------
Summary: CreateBalancers behave the same with option 0 or 2
Key: MODCLUSTER-430
URL: https://issues.jboss.org/browse/MODCLUSTER-430
Project: mod_cluster
Issue Type: Bug
Components: Native (httpd modules)
Affects Versions: 1.3.0.Final
Environment: RHEL 6.4.0
Apache HTTPD 2.4.10
JBoss 6.1.1
Mod_cluster 1.3.0 Final
Reporter: John Jerome
Assignee: Jean-Frederic Clere
The directive CreateBalancers with directive 0 or 2 creates the balancers on all httpd vhosts.
With option 2, the balancers should be created on the main server only, not in the vhosts.
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tomcat 8
by Mennat Mokhtar
Does mod_cluster currently support tomcat 8?
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[JBoss JIRA] (MODCLUSTER-390) add failonstatus to mod_cluster
by Michal Babacek (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-390?page=com.atlassian.jira.pl... ]
Michal Babacek commented on MODCLUSTER-390:
-------------------------------------------
Very well, I've written an automated test that reflects the _comment #4_ and it works:
h3. mod_cluster before the feature was implemented
Some initial requests, HTTP 200...
{code}
Trying to retrieve content from http://192.168.122.204:2181/clusterbench/httpcode/?http_code=200, response code = 200
HTTP Code was: 200
JVM route: jboss-eap-6.2
Session ID: 4VKyGpxfi2MvHCOKC4A-l-5i.jboss-eap-6.2
Session isNew: false
Trying to retrieve content from http://192.168.122.204:2181/clusterbench/httpcode/?http_code=200, response code = 200
HTTP Code was: 200
JVM route: jboss-eap-6.2
Session ID: 4VKyGpxfi2MvHCOKC4A-l-5i.jboss-eap-6.2
Session isNew: false
{code}
Now, let's use HTTP 201, the *failonstatus=201* setting...
{code}
Trying to retrieve content from http://192.168.122.204:2181/clusterbench/httpcode/?http_code=201, response code = 201
HTTP Code was: 201
JVM route: jboss-eap-6.2
Session ID: 4VKyGpxfi2MvHCOKC4A-l-5i.jboss-eap-6.2
Session isNew: false
{code}
The response comes from the same node, that's fine, but the subsequent requests come from that node as well, i.e. the feature is not implemented:
{code}
Trying to retrieve content from http://192.168.122.204:2181/clusterbench/httpcode/?http_code=200, response code = 200
HTTP Code was: 200
JVM route: jboss-eap-6.2
Session ID: 4VKyGpxfi2MvHCOKC4A-l-5i.jboss-eap-6.2
Session isNew: false
Trying to retrieve content from http://192.168.122.204:2181/clusterbench/httpcode/?http_code=200, response code = 200
HTTP Code was: 200
JVM route: jboss-eap-6.2
Session ID: 4VKyGpxfi2MvHCOKC4A-l-5i.jboss-eap-6.2
Session isNew: false
{code}
h3. current mod_cluster 1.2.9, feature implemented
Some initial requests, HTTP 200...
{code}
Trying to retrieve content from http://192.168.122.204:2181/clusterbench/httpcode/?http_code=200, response code = 200
HTTP Code was: 200
JVM route: jboss-eap-6.3
Session ID: cETRQkQtnJk9R0I4eaGaoril.jboss-eap-6.3
Session isNew: false
Trying to retrieve content from http://192.168.122.204:2181/clusterbench/httpcode/?http_code=200, response code = 200
HTTP Code was: 200
JVM route: jboss-eap-6.3
Session ID: cETRQkQtnJk9R0I4eaGaoril.jboss-eap-6.3
Session isNew: false
{code}
Now, let's use HTTP 201, the *failonstatus=201* setting...
{code}
Trying to retrieve content from http://192.168.122.204:2181/clusterbench/httpcode/?http_code=201, response code = 201
HTTP Code was: 201
JVM route: jboss-eap-6.3
Session ID: cETRQkQtnJk9R0I4eaGaoril.jboss-eap-6.3
Session isNew: false
{code}
The response comes from the same node, that's fine, but the subsequent requests come from a different node, i.e. the feature is implemented:
{code}
Trying to retrieve content from http://192.168.122.204:2181/clusterbench/httpcode/?http_code=200, response code = 200
HTTP Code was: 200
JVM route: jboss-eap-6.3-2
Session ID: cETRQkQtnJk9R0I4eaGaoril.jboss-eap-6.3-2
Session isNew: false
Trying to retrieve content from http://192.168.122.204:2181/clusterbench/httpcode/?http_code=200, response code = 200
HTTP Code was: 200
JVM route: jboss-eap-6.3-2
Session ID: cETRQkQtnJk9R0I4eaGaoril.jboss-eap-6.3-2
Session isNew: false
{code}
h3. Regarding Status
As to your other question, the *jboss-eap-6.3* worker was in *NOTOK* for a period of time just until the next *STATUS* message was received. After that, both *jboss-eap-6.3* and *jboss-eap-6.3-2* have been in *OK* status.
So, what shall we do about it? I think it's probably all right.
1. I have a certain set of HTTP codes that I want to trigger a failover
2. it works, failover occurs (on the *second* request)
3. the worker is put back in business, because there is no reason to believe it's broken, i.e. the fact that a web app returned a specific code does not suggest that the whole box should be kept in *NOTOK*...
WDYT?
> add failonstatus to mod_cluster
> -------------------------------
>
> Key: MODCLUSTER-390
> URL: https://issues.jboss.org/browse/MODCLUSTER-390
> Project: mod_cluster
> Issue Type: Enhancement
> Affects Versions: 1.2.6.Final, 1.3.0.Final
> Reporter: Jean-Frederic Clere
> Assignee: Jean-Frederic Clere
> Priority: Critical
> Fix For: 1.2.8.Final, 1.3.1.Alpha3
>
> Attachments: error_log.zip
>
>
> The feature was added in httpd-2.2.17 in the mod_proxy_balancer we just need to copy that code and find a way to configure it,
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[JBoss JIRA] (MODCLUSTER-390) add failonstatus to mod_cluster
by Jean-Frederic Clere (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-390?page=com.atlassian.jira.pl... ]
Jean-Frederic Clere commented on MODCLUSTER-390:
------------------------------------------------
Please reread my comments:
1 - comment #4 the response it sent and the worker is marked in error.
2 - the STATUS will retry the worker and mark it up.
Probalby 2 isn't what your test is excepting but that is what you are testing (wait enough for the STATUS to be received by httpd and the worker will be marked OK).
Please retest to confirm.
Actually the behaviour doesn't make much sense I think the STATUS should put the worker in OK state when failonstatus is used I am going to look how to fix that.
> add failonstatus to mod_cluster
> -------------------------------
>
> Key: MODCLUSTER-390
> URL: https://issues.jboss.org/browse/MODCLUSTER-390
> Project: mod_cluster
> Issue Type: Enhancement
> Affects Versions: 1.2.6.Final, 1.3.0.Final
> Reporter: Jean-Frederic Clere
> Assignee: Jean-Frederic Clere
> Priority: Critical
> Fix For: 1.2.8.Final, 1.3.1.Alpha3
>
> Attachments: error_log.zip
>
>
> The feature was added in httpd-2.2.17 in the mod_proxy_balancer we just need to copy that code and find a way to configure it,
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[JBoss JIRA] (MODCLUSTER-390) add failonstatus to mod_cluster
by Michal Babacek (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-390?page=com.atlassian.jira.pl... ]
Michal Babacek commented on MODCLUSTER-390:
-------------------------------------------
Hmm, apart from the message, could you comment on my question:
{quote}
@[~jfclere] Hmm, the forced failover doesn't happen at once, it takes several requests...is that the correct behaviour?
{quote}
I understand that the _forcerecovery_ ain't supported, but there should be an immediate failover if the listed status is hit, IMHO.
> add failonstatus to mod_cluster
> -------------------------------
>
> Key: MODCLUSTER-390
> URL: https://issues.jboss.org/browse/MODCLUSTER-390
> Project: mod_cluster
> Issue Type: Enhancement
> Affects Versions: 1.2.6.Final, 1.3.0.Final
> Reporter: Jean-Frederic Clere
> Assignee: Jean-Frederic Clere
> Priority: Critical
> Fix For: 1.2.8.Final, 1.3.1.Alpha3
>
> Attachments: error_log.zip
>
>
> The feature was added in httpd-2.2.17 in the mod_proxy_balancer we just need to copy that code and find a way to configure it,
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[JBoss JIRA] (MODCLUSTER-390) add failonstatus to mod_cluster
by Jean-Frederic Clere (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-390?page=com.atlassian.jira.pl... ]
Jean-Frederic Clere commented on MODCLUSTER-390:
------------------------------------------------
forcerecovery isn't supported in mod_cluster... Basically it will be ignored.
> add failonstatus to mod_cluster
> -------------------------------
>
> Key: MODCLUSTER-390
> URL: https://issues.jboss.org/browse/MODCLUSTER-390
> Project: mod_cluster
> Issue Type: Enhancement
> Affects Versions: 1.2.6.Final, 1.3.0.Final
> Reporter: Jean-Frederic Clere
> Assignee: Jean-Frederic Clere
> Priority: Critical
> Fix For: 1.2.8.Final, 1.3.1.Alpha3
>
> Attachments: error_log.zip
>
>
> The feature was added in httpd-2.2.17 in the mod_proxy_balancer we just need to copy that code and find a way to configure it,
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[JBoss JIRA] (MODCLUSTER-390) add failonstatus to mod_cluster
by Jean-Frederic Clere (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-390?page=com.atlassian.jira.pl... ]
Jean-Frederic Clere commented on MODCLUSTER-390:
------------------------------------------------
Looking to the log I have seen that the STATUS message is retrying the worker without taking care of the retry value.
> add failonstatus to mod_cluster
> -------------------------------
>
> Key: MODCLUSTER-390
> URL: https://issues.jboss.org/browse/MODCLUSTER-390
> Project: mod_cluster
> Issue Type: Enhancement
> Affects Versions: 1.2.6.Final, 1.3.0.Final
> Reporter: Jean-Frederic Clere
> Assignee: Jean-Frederic Clere
> Priority: Critical
> Fix For: 1.2.8.Final, 1.3.1.Alpha3
>
> Attachments: error_log.zip
>
>
> The feature was added in httpd-2.2.17 in the mod_proxy_balancer we just need to copy that code and find a way to configure it,
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[JBoss JIRA] (MODCLUSTER-429) Some problems were encountered while building the effective model for org.jboss:User-Guide-en:jdocbook:1.3.1.Alpha3-SNAPSHOT
by Radoslav Husar (JIRA)
[ https://issues.jboss.org/browse/MODCLUSTER-429?page=com.atlassian.jira.pl... ]
Radoslav Husar commented on MODCLUSTER-429:
-------------------------------------------
Looks like the maven coordinates are missing modcluster in the full name as well.
> Some problems were encountered while building the effective model for org.jboss:User-Guide-en:jdocbook:1.3.1.Alpha3-SNAPSHOT
> ----------------------------------------------------------------------------------------------------------------------------
>
> Key: MODCLUSTER-429
> URL: https://issues.jboss.org/browse/MODCLUSTER-429
> Project: mod_cluster
> Issue Type: Bug
> Components: Core & Container Integration (Java)
> Reporter: Radoslav Husar
> Assignee: Radoslav Husar
> Priority: Minor
> Fix For: 1.3.1.Alpha3
>
>
> [WARNING]
> [WARNING] Some problems were encountered while building the effective model for org.jboss:User-Guide-en:jdocbook:1.3.1.Alpha3-SNAPSHOT
> [WARNING] 'artifactId' contains an expression but should be a constant. @ org.jboss:User-Guide-${translation}:1.3.1.Alpha3-SNAPSHOT, /home/rhusar/git/mod_cluster/docs/userguide/pom.xml, line 31, column 17
> [WARNING] 'parent.relativePath' points at org.jboss.mod_cluster:org.jboss.mod_cluster-docs instead of org.jboss:jboss-parent, please verify your project structure @ org.jboss:User-Guide-${translation}:1.3.1.Alpha3-SNAPSHOT, /home/rhusar/git/mod_cluster/docs/userguide/pom.xml, line 24, column 13
> [WARNING]
> [WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
> [WARNING]
> [WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
> [WARNING]
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