apache - Plone taking a long time to respond to byte-range request -

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we have 2 upgraded plone 4.3.2 instances behind haproxy load balancer behind apache.

we limit each plone instance serving 2 concurrent requests using haproxy configuration.

we encountered issue whereby client sent 4 byte-range requests in quick succession pdf each took between 6 , 8 minutes response. locked available requests 6 minutes , haproxy timed out other requests in queue. pdf stored atfile object in plone believe should have been migrated blob storage in our recent upgrade.

my question steps should take prevent similar scenario in future?

i'm interested in:

  • how debug why byte-range requests on otherwise lightly loaded server should take long respond
  • how plone.app.blob deals byte-range requests
  • is possible configure apache such byte-range requests served cache not back-end server

as requested here haproxy.cfg superfluous configuration stripped out.

global     maxconn         450     spread-checks   3  defaults     log             /dev/log local0     mode            http     option          http-server-close     option          abortonclose     option          redispatch     option          httplog     timeout connect 7s     timeout client  300s     timeout queue   120s     timeout server  300s  listen cms 127.0.0.1:18181     id 3     balance leastconn     option          httpchk     http-check      send-state     timeout check   10s      acl cms_edit url_dom xxx.xxx.xxx.xxx     acl cms_not_ok nbsrv() lt 2     block if cms_edit cms_not_ok      server cms_instance1 app:18081 check downinter 10s maxconn 2 rise 1 slowstart 300s     server cms_instance2 app:18082 check downinter 10s maxconn 2 rise 1 slowstart 300s

you can install https://pypi.python.org/pypi/products.longrequestlogger , check log file see request gets stuck.


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