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From "Propes, Barry L [GCG-NAOT]" <barry.l.pro...@citigroup.com>
Subject RE: [OT] mod_jk -> tomcat sending delay
Date Tue, 13 Feb 2007 22:44:23 GMT
New using Tomcat 5 series -- just where is mod_jk within Tomcat?

Please let me know.

Thanks,


-----Original Message-----
From: babu [mailto:babulalsatasiya@gmail.com]
Sent: Friday, February 09, 2007 4:11 PM
To: users@tomcat.apache.org
Subject: Re: [OT] mod_jk -> tomcat sending delay



Hi,

We are also facing same problem and we are using mod_jk 1.2.6 with apache
2.0.53 and tomcat 5.0.27. Mod_jk is configured with loadbalancer. We have
Apache+mod_jk with LB +  9 tomcats in backend. Mod_jk is set with sticky bit
set.

Partial workers.properites

worker.list=loadbalancer
worker.loadbalancer.type=lb
worker.loadbalancer.balanced_workers=tc_1_1,tc_1_2,tc_1_3,tc_2_1,tc_2_2,tc_2_3,tc_3_1,tc_3_2,tc_3_3



worker.tc_1_1.host=cna-prod-app-25
worker.tc_1_1.port=8000
worker.tc_1_1.type=ajp13
worker.tc_1_1.lbfactor=1
worker.tc_1_1.cachesize=50
worker.tc_1_1.cache_timeout=180
worker.tc_1_1.socket_timeout=300
worker.tc_1_1.socket_keepalive=1
worker.tc_1_1.recovery_options=0
worker.tc_1_1.sticky_session=1

server.xml

<Connector port="8000"
              protocol="AJP/1.3"
              address="cna-prod-app-25"
              minProcessors="50"
              maxProcessors="100"
              enableLookups="false"
              debug="0"
              URIEncoding="UTF-8"
                          connectionTimeout="180000"
              />

I found in one of discussion board, that connection timeout in sever.xml and
timeout parameters in workers.properties should be matched properly and also
found that in server.xml its in miliseconds and in workers.properites it is
seconds.


We do not find any issue at client side but erorr keeps going in mod_jk log.
( I am not sure of client side issues are there or not)


mod_jk log

[Fri Feb 09 22:00:55 2007]  [jk_ajp_common.c (1250)]: Tomcat is down or
network problems. No response has been sent to the client (yet)
[Fri Feb 09 22:00:55 2007]  [jk_ajp_common.c (1449)]: ERROR: Receiving from
tomcat failed, recoverable operation. err=2
[Fri Feb 09 22:00:55 2007]  [jk_ajp_common.c (1477)]: Error connecting to
tomcat. Tomcat is probably not started or is listening on the wrong port.
worker=tc_3_3 failed errno = 0
[Fri Feb 09 22:01:21 2007]  [jk_ajp_common.c (783)]: ERROR: can't receive
the response message from tomcat, network problems or tomcat is down
(128.107.229.109:8002), err=-1
[Fri Feb 09 22:01:21 2007]  [jk_ajp_common.c (1250)]: Tomcat is down or
network problems. No response has been sent to the client (yet)
[Fri Feb 09 22:01:21 2007]  [jk_ajp_common.c (1449)]: ERROR: Receiving from
tomcat failed, recoverable operation. err=2
[Fri Feb 09 22:01:21 2007]  [jk_ajp_common.c (1477)]: Error connecting to
tomcat. Tomcat is probably not started or is listening on the wrong port.
worker=tc_1_3 failed errno = 0
[Fri Feb 09 22:01:41 2007]  [jk_ajp_common.c (783)]: ERROR: can't receive
the response message from tomcat, network problems or tomcat is down
(128.107.229.110:8001), err=-1
[Fri Feb 09 22:01:41 2007]  [jk_ajp_common.c (1250)]: Tomcat is down or
network problems. No response has been sent to the client (yet)
[Fri Feb 09 22:01:41 2007]  [jk_ajp_common.c (1449)]: ERROR: Receiving from
tomcat failed, recoverable operation. err=2
[Fri Feb 09 22:01:41 2007]  [jk_ajp_common.c (1477)]: Error connecting to
tomcat. Tomcat is probably not started or is listening on the wrong port.
worker=tc_2_2 failed errno = 0
[Fri Feb 09 22:01:44 2007]  [jk_ajp_common.c (783)]: ERROR: can't receive
the response message from tomcat, network problems or tomcat is down
(128.107.229.109:8000), err=-1
[Fri Feb 09 22:01:44 2007]  [jk_ajp_common.c (1250)]: Tomcat is down or
network problems. No response has been sent to the client (yet)
[Fri Feb 09 22:01:44 2007]  [jk_ajp_common.c (1449)]: ERROR: Receiving from
tomcat failed, recoverable operation. err=0
[Fri Feb 09 22:02:03 2007]  [jk_ajp_common.c (783)]: ERROR: can't receive
the response message from tomcat, network problems or tomcat is down
(128.107.229.110:8002), err=-1
[Fri Feb 09 22:02:03 2007]  [jk_ajp_common.c (1250)]: Tomcat is down or
network problems. No response has been sent to the client (yet)
[Fri Feb 09 22:02:03 2007]  [jk_ajp_common.c (1449)]: ERROR: Receiving from
tomcat failed, recoverable operation. err=1
[Fri Feb 09 22:02:49 2007]  [jk_ajp_common.c (783)]: ERROR: can't receive
the response message from tomcat, network problems or tomcat is down
(128.107.229.110:8002), err=-1
[Fri Feb 09 22:02:49 2007]  [jk_ajp_common.c (1250)]: Tomcat is down or
network problems. No response has been sent to the client (yet)
[Fri Feb 09 22:02:49 2007]  [jk_ajp_common.c (1449)]: ERROR: Receiving from
tomcat failed, recoverable operation. err=0
[Fri Feb 09 22:02:59 2007]  [jk_ajp_common.c (783)]: ERROR: can't receive
the response message from tomcat, network problems or tomcat is down
(128.107.229.110:8001), err=-1
[Fri Feb 09 22:02:59 2007]  [jk_ajp_common.c (1250)]: Tomcat is down or
network problems. No response has been sent to the client (yet)
[Fri Feb 09 22:02:59 2007]  [jk_ajp_common.c (1449)]: ERROR: Receiving from
tomcat failed, recoverable operation. err=2
[Fri Feb 09 22:02:59 2007]  [jk_ajp_common.c (1477)]: Error connecting to
tomcat. Tomcat is probably not started or is listening on the wrong port.
worker=tc_2_2 failed errno = 0

If you find any soluttion to this then please update me with your solution.

with regards,

Babulal Satasiya

Cisco System Inc.
Sanjose, CA.


Marcin ZajÄ…czkowski wrote:
> 
> Hi,
> 
> 
> I observe in mod_jk's log errors:
> [error] ajp_get_reply::jk_ajp_common.c (1566): (ajp13w) Tomcat is down 
> or refused connection. No response has been sent to the client (yet)
> 
> In the rush hours (20-30 requests/second) up to several entries per hour.
> Sometimes it's followed by:
> [error] ajp_service::jk_ajp_common.c (1928): (ajp13w) Connecting to 
> tomcat failed. Tomcat is probably not started or is listening on the 
> wrong port
> or
> [error] ajp_connection_tcp_get_message::jk_ajp_common.c (948): (ajp13w) 
> can't receive the response message from tomcat, network problems or 
> tomcat is down (127.0.0.1:8009), err=-104
> 
> but usually it is covered by another retries. It's corresponding to 
> exception in tomcat:
> ERROR [org.apache.jk.common.HandlerRequest] Error decoding request
> java.net.SocketTimeoutException: Read timed out
> 
> *Note* Post is quite long because of info from logs. To get know what it 
> is about it is enough to read descriptions next to numbers.
> 
> 
> I increased logs granularity (mod_jk and tomcat + tcpdump) and in a few 
> checked issues it looks like:
> 
> *1*. mod_jk talks with tomcat and some request is serviced.
> 
> (...)
> [11:10:30] [debug] ajp_process_callback::jk_ajp_common.c (1491): AJP13 
> protocol: Reuse is OK
> [debug] ajp_done::jk_ajp_common.c (2258): recycling connection pool 
> slot=0 for worker ajp13w
> [debug] jk_handler::mod_jk.c (2126): Service finished with status=200 
> for worker=wlb
> 
> *2*. A few seconds later thread is used again by an another request.
> 
> [11:10:32] [debug] wc_get_worker_for_name::jk_worker.c (114): found a 
> worker wlb
> [debug] wc_get_name_for_type::jk_worker.c (290): Found worker type 'lb'
> [debug] init_ws_service::mod_jk.c (584): Service protocol=HTTP/1.1 
> method=POST (...)
> [debug] service::jk_lb_worker.c (840): service sticky_session=1 
> id='8A49C0D934C8A115342BA5CBFC79C434'
> [debug] service::jk_lb_worker.c (860): service worker=ajp13w route=ajp13w
> [debug] ajp_get_endpoint::jk_ajp_common.c (2315): acquired connection 
> pool slot=0
> [debug] ajp_marshal_into_msgb::jk_ajp_common.c (548): ajp marshaling done
> [debug] ajp_service::jk_ajp_common.c (1771): processing ajp13w with 2 
> retries
> [debug] ajp_connection_tcp_send_message::jk_ajp_common.c (893): sending 
> to ajp13 pos=4 len=307 max=8192
> (...) [header is sent and it is received by tomcat]
> 
> *3*.
> a) mod_jk tries to send body:
> 
> [11:10:32] [debug] ajp_send_request::jk_ajp_common.c (1273): request 
> body to send 646 - request body to resend 0
> 
> b) tomcat is waiting for it:
> DEBUG [org.apache.jk.common.ChannelSocket] Call next 0 
> org.apache.jk.common.HandlerRequest@1ca8b3d
> DEBUG [org.apache.jk.common.HandlerRequest] Handling 2
> DEBUG [org.apache.jk.common.ChannelSocket] receive()
> 
> *4*. 5 seconds later (connector timeout is 5000ms) tomcat throws
> exception:
> [11:10:37] ERROR [org.apache.jk.common.HandlerRequest] Error decoding 
> request
> java.net.SocketTimeoutException: Read timed out
> and resets connection (regarding to tcpdump log)
> 
> *5*. A few more seconds later (e.g. 8 from point 3) mod_jk starts 
> sending a body:
> [11:10:40] [debug] ajp_connection_tcp_send_message::jk_ajp_common.c 
> (893): sending to ajp13 pos=4 len=652 max=8192
> [debug] ajp_connection_tcp_send_message::jk_ajp_common.c (893): 0000 
> 12 34 02 88 02 86 3C 3F (...) [body's dump]
> 
> *6*. Unfortunately connection was already reseted by tomcat and mod_jk 
> got info about that:
> [11:10:40] [info]  ajp_connection_tcp_get_message::jk_ajp_common.c 
> (942): (ajp13w) Tomcat has forced a connection close for socket 28
> [error] ajp_get_reply::jk_ajp_common.c (1566): (ajp13w) Tomcat is down 
> or refused connection. No response has been sent to the client (yet)
> [info]  ajp_service::jk_ajp_common.c (1877): (ajp13w) receiving from 
> tomcat failed, recoverable operation attempt=0
> 
> *7*. mod_jk tries to do send request again to tomcat:
> [11:10:40] [info]  ajp_service::jk_ajp_common.c (1916): (ajp13w) sending 
> request to tomcat failed,  recoverable operation attempt=1
> [debug] jk_open_socket::jk_connect.c (335): socket TCP_NODELAY set to On
> [debug] jk_open_socket::jk_connect.c (433): trying to connect socket 28 
> to 127.0.0.1:8009
> [debug] jk_open_socket::jk_connect.c (459): socket 28 connected to 
> 127.0.0.1:8009
> [debug] ajp_connect_to_endpoint::jk_ajp_common.c (847): Connected socket 
> 28 to (127.0.0.1:8009)
> [debug] ajp_connection_tcp_send_message::jk_ajp_common.c (893): sending 
> to ajp13 pos=4 len=307 max=8192
> 
> Usually (but not always) it is able to do that without errors.
> 
> I sniffed into mod_jk source code, but I haven't found a place where it 
> can stuck.
> 
> 
> *Question*
> What can be delay (about 8 seconds) in mod_jk between sending HTTP 
> header and HTTP content caused by?
> 
> 
> I use Apache 2.0.52 (with MPM prefork), mod_jk 1.2.20, JBoss 3.2.5 with 
> Tomcat 5.0 (probably 5.0.27) and Red Hat Enterprise Linux ES 4.
> 
> mod_jk configuration is quite simple, without load balancing (and wasn't 
> changed for years).
> 
> <workers.properties>
> workers.tomcat_home=/jboss/deploy/jbossweb-tomcat50.sar
> workers.java_home=/jboss/java
> ps=/
> 
> worker.list=wlb,jkstatus
> 
> worker.ajp13w.type=ajp13
> worker.ajp13w.host=localhost
> worker.ajp13w.port=8009
> 
> worker.wlb.type=lb
> worker.wlb.balance_workers=ajp13w
> </workers.properties>
> 
> The only change in mod_jk config was:
> JkShmSize 1024k
> 
> <servel.xml>
>        <Connector port="8009" address="127.0.0.1"
>         minProcessors="5" maxProcessors="100"
>         enableLookups="false" acceptCount="100" debug="0"
>         connectionTimeout="5000" useURIValidationHack="false"
>         protocol="AJP/1.3"/>
> </servel.xml>
> 
> 
> Thanks for your advice
> Marcin
> 
> 
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> 
> 

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