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  1. JBoss Core Services
  2. JBCS-946

Setting smax results in very small max connection pool on mod_cluster

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      mod_clusters connection pool is sized differently in httpd 2.4 now compared to httpd 2.2. If smax is set, mod_cluster now sets that pool max to smax+1:

              if (worker->s->hmax < node->mess.smax)
            worker->s->hmax = node->mess.smax + 1;

      Before the max would be ThreadsPerChild+1. Now if someone sets smax=1, then they start seeing severe responsiveness issues if moving an equivalent config from httpd 2.2 to httpd 2.4 because it fails to acquire a connection with 3 concurrent requests:

      [Tue Apr 21 10:02:08.995604 2020] [proxy:debug] [pid 27148:tid 139854005438432] proxy_util.c(1981): AH00927: initializing worker http://127.0.0.1:8080 local
[Tue Apr 21 10:02:08.995616 2020] [proxy:debug] [pid 27148:tid 139854005438432] proxy_util.c(2016): AH00930: initialized pool in child 27148 for () min=0 max=2 smax=1
...
[Tue Apr 21 10:20:41.123443 2020] [:debug] [pid 27147:tid 139853093992192] mod_proxy_cluster.c(2479): proxy: byrequests balancer DONE (http:///127.0.0.1:8080)
[Tue Apr 21 10:20:41.123456 2020] [proxy:debug] [pid 27147:tid 139853093992192] proxy_util.c(1919): AH00924: worker http:///127.0.0.1:8080 shared already initialized
[Tue Apr 21 10:20:41.123460 2020] [proxy:debug] [pid 27147:tid 139853093992192] proxy_util.c(1976): AH00926: worker http:///127.0.0.1:8080 local already initialized
[Tue Apr 21 10:20:41.123464 2020] [proxy:debug] [pid 27147:tid 139853093992192] mod_proxy.c(1254): [client 127.0.0.1:40760] AH01143: Running scheme balancer handler (attempt 0)
[Tue Apr 21 10:20:41.125726 2020] [proxy:error] [pid 27147:tid 139853093992192] (70007)The timeout specified has expired: AH00941: HTTP: failed to acquire connection for ()

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          incorporates

          Bug - A problem that impairs or prevents the functions of the product. MODCLUSTER-721 Setting smax results in very small max connection pool on mod_cluster

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Resolved
          is cloned by

          Bug - A problem that impairs or prevents the functions of the product. JBCS-1009 Setting ThreadsPerChild on mod_cluster - RHEL8

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Closed
          is incorporated by

          Bug - A problem that impairs or prevents the functions of the product. JBCS-941 Upgrade mod_cluster native to 1.3.14

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Closed

          Bug - A problem that impairs or prevents the functions of the product. JBCS-955 Upgrade mod_cluster native to 1.3.14

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Closed

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              gzaronik@redhat.com George Zaronikas
              rhn-support-aogburn Aaron Ogburn
              Athanasios Ploumis Athanasios Ploumis (Inactive)
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