Requests are considerably delayed by mod_jk's worker maintenance

Issue

• We use mod_jk and see requests delayed through the httpd/mod_jk proxy. Debug logging suggests a lot of time is spent in worker maintenance before ever proxying the request, for example:

[Tue Nov 25 12:17:14 2014][3472:140704287799264] [debug] wc_maintain::jk_worker.c (338): Maintaining worker node1
[Tue Nov 25 12:18:44 2014][3472:140704287799264] [debug] wc_maintain::jk_worker.c (338): Maintaining worker loadbalancer
[Tue Nov 25 12:20:44 2014][3472:140704287799264] [debug] wc_get_name_for_type::jk_worker.c (292): Found worker type 'lb'
[Tue Nov 25 12:20:44 2014][3472:140704287799264] [debug] init_ws_service::mod_jk.c (1097): Service protocol=HTTP/1.1 method=GET ssl=true host=(null) addr=127.0.0.1 name=localhost port=8443 auth=(null) user=(null) laddr=127.0.0.1 raddr=127.0.0.1 uri=/app