[mod_cluster-issues] [JBoss JIRA] (MODCLUSTER-407) worker-timeout can cause httpd thread stalls

[Aaron Ogburn (JIRA)]

     [ https://issues.jboss.org/browse/MODCLUSTER-407?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aaron Ogburn updated MODCLUSTER-407:
------------------------------------

              Status: Pull Request Sent  (was: Open)
    Git Pull Request: https://github.com/modcluster/mod_cluster/pull/76


Instead of relying on balancer->timeout to determine recursion, I added an additional param to find_best_worker to indicate whether or not to do the recursion.  That's a bit simpler, and I'm not seeing any thread stalls with that logic.

> worker-timeout can cause httpd thread stalls
> --------------------------------------------
>
>                 Key: MODCLUSTER-407
>                 URL: https://issues.jboss.org/browse/MODCLUSTER-407
>             Project: mod_cluster
>          Issue Type: Bug
>    Affects Versions: 1.2.8.Final
>            Reporter: Aaron Ogburn
>            Assignee: Jean-Frederic Clere
>
> Setting a modcluster worker-timeout can stall requests and threads on the httpd side when the requests are received with workers in a down state.  A stack of the problem thread looks like the following (recursive loops through mod_proxy_cluster from #160 to #2):
> #0  0x00007ff8eb547533 in select () from /lib64/libc.so.6
> #1  0x00007ff8eba39185 in apr_sleep () from /usr/lib64/libapr-1.so.0
> #2  0x00007ff8e84be0d1 in ?? () from /etc/httpd/modules/mod_proxy_cluster.so
> ...
> #160 0x00007ff8e84beb9f in ?? () from /etc/httpd/modules/mod_proxy_cluster.so
> #161 0x00007ff8e88d2116 in proxy_run_pre_request () from /etc/httpd/modules/mod_proxy.so
> #162 0x00007ff8e88d9186 in ap_proxy_pre_request () from /etc/httpd/modules/mod_proxy.so
> #163 0x00007ff8e88d63c2 in ?? () from /etc/httpd/modules/mod_proxy.so



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