Re: Errors in session replication and very high server load

Mon, 21 Dec 2009 01:53:02 -0800 

Thanks for the reply.

I have tried to figure out why the load is high but I couldn't. Any hints?

Thanks,
Mohamed Mohamedin
----- Original Message ----- From: "Filip Hanik - Dev Lists" <devli...@hanik.com> 
To: "Tomcat Users List" <users@tomcat.apache.org>
Sent: Sunday, December 20, 2009 3:56 PM
Subject: Re: Errors in session replication and very high server load



Well, the log messages you see, are all based on timeouts.
If your system has a load average of 12, unless you have a 12-way machine, that is very high, and could be the cause of your timeouts. 
You will need to figure out what is causing the high load average.

Filip

On 12/18/2009 01:30 AM, mohame...@easy-dialog.info wrote:

Dear All,
I have a strange problem. When I added a new server to my tomcat cluster I have noticed that the load is getting very high on the server. Tomcat log show a lot 
of these lines
18.12.2009 09:07:14 org.apache.catalina.ha.tcp.SimpleTcpCluster memberAdded 
INFO: Replication member
added:org.apache.catalina.tribes.membership.MemberImpl[tcp://{62, 75, -127, -120}:4000,{62, 75, -127, -120},4000, alive=65087504,id={-64 -42 103 97 8 -7 69 -88 -113 -106 -32 -64 46 76 -117 -58 }, payload={}, command={}, domain={}, ] 
18.12.2009 09:07:14
org.apache.catalina.tribes.group.interceptors.TcpFailureDetector
memberDisappeared
INFO: Verification complete. Member still
alive[org.apache.catalina.tribes.membership.MemberImpl[tcp://{62, 75, -127, -122}:4000,{62, 75, -127, -122},4000, alive=64996684,id={-15 62 -53 -50 -43 81 75 18 -112 -43 58 -102 69 72 83 21 }, payload={}, command={}, domain={}, ]] 
18.12.2009 09:07:19
org.apache.catalina.tribes.group.interceptors.TcpFailureDetector
performBasicCheck
WARNUNG: Member added, even though we werent
notified:org.apache.catalina.tribes.membership.MemberImpl[tcp://{62, 75, -127, -117}:4000,{62, 75, -127, -117},4000, alive=58229968,id={16 -115 -21 -109 18 -76 79 58 -95 -17 57 -32 -69 -111 -20 28 }, payload={}, command={}, domain={}, ] 18.12.2009 09:07:19 org.apache.catalina.ha.tcp.SimpleTcpCluster memberAdded 
INFO: Replication member
added:org.apache.catalina.tribes.membership.MemberImpl[tcp://{62, 75, -127, -117}:4000,{62, 75, -127, -117},4000, alive=58229968,id={16 -115 -21 -109 18 -76 79 58 -95 -17 57 -32 -69 -111 -20 28 }, payload={}, command={}, domain={}, ] 
18.12.2009 09:08:10 org.apache.catalina.ha.tcp.SimpleTcpCluster
memberDisappeared
INFO: Received member
disappeared:org.apache.catalina.tribes.membership.MemberImpl[tcp://{62, 75, -127, -121}:4000,{62, 75, -127, -121},4000, alive=64986581,id={-87 -91 115 -83 80 64 76 -9 -68 -107 -109 52 0 -47 109 98 }, payload={}, command={}, domain={}, 
]
18.12.2009 09:08:10
org.apache.catalina.tribes.group.interceptors.TcpFailureDetector
performBasicCheck
INFO: Suspect member, confirmed
dead.[org.apache.catalina.tribes.membership.MemberImpl[tcp://{62, 75, -127, -121}:4000,{62, 75, -127, -121},4000, alive=64986581,id={-87 -91 115 -83 80 64 76 -9 -68 -107 -109 52 0 -47 109 98 }, payload={}, command={}, domain={}, ]] 
18.12.2009 09:08:10
org.apache.catalina.tribes.group.interceptors.TcpFailureDetector
memberDisappeared
INFO: Received
memberDisappeared[org.apache.catalina.tribes.membership.MemberImpl[tcp://{62,
75, -127, -121}:4000,{62, 75, -127, -121},4000, alive=65045054,id={-87 -91 115 
-83 80 64 76 -9 -68 -107 -109 52 0 -47 109 98 }, payload={}, command={},
domain={}, ]] message. Will verify.
18.12.2009 09:08:10
org.apache.catalina.tribes.group.interceptors.TcpFailureDetector
memberDisappeared
INFO: Verification complete. Member still
alive[org.apache.catalina.tribes.membership.MemberImpl[tcp://{62, 75, -127, -121}:4000,{62, 75, -127, -121},4000, alive=65045054,id={-87 -91 115 -83 80 64 76 -9 -68 -107 -109 52 0 -47 109 98 }, payload={}, command={}, domain={}, ]] 
18.12.2009 09:08:10
org.apache.catalina.tribes.group.interceptors.TcpFailureDetector
memberDisappeared
INFO: Received
memberDisappeared[org.apache.catalina.tribes.membership.MemberImpl[tcp://{62,
75, -127, -122}:4000,{62, 75, -127, -122},4000, alive=65054434,id={-15 62 -53 
-50 -43 81 75 18 -112 -43 58 -102 69 72 83 21 }, payload={}, command={},
domain={}, ]] message. Will verify.
18.12.2009 09:08:10
org.apache.catalina.tribes.group.interceptors.TcpFailureDetector
memberDisappeared
INFO: Received
memberDisappeared[org.apache.catalina.tribes.membership.MemberImpl[tcp://{62,
75, -127, -118}:4000,{62, 75, -127, -118},4000, alive=58290426,id={101 61 65 84 
-59 -114 65 -57 -106 8 -118 -25 -55 56 -82 111 }, payload={}, command={},
domain={}, ]] message. Will verify.
18.12.2009 09:08:10
org.apache.catalina.tribes.group.interceptors.TcpFailureDetector
memberDisappeared
INFO: Received
memberDisappeared[org.apache.catalina.tribes.membership.MemberImpl[tcp://{62,
75, -127, -120}:4000,{62, 75, -127, -120},4000, alive=65141440,id={-64 -42 103 97 8 -7 69 -88 -113 -106 -32 -64 46 76 -117 -58 }, payload={}, command={}, 
domain={}, ]] message. Will verify.
Also the load on the server is getting very high (while no CPU usage). This is 
the output of top
top - 08:29:51 up 63 days, 22:53, 1 user, load average: 12.95, 10.61, 8.35 
Tasks: 163 total, 1 running, 162 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.7%us, 0.6%sy, 0.0%ni, 98.4%id, 0.3%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 33023640k total, 19154120k used, 13869520k free, 373012k buffers
Swap: 999992k total, 676k used, 999316k free, 13818440k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1 root 20 0 10312 748 620 S 0 0.0 1:54.74 init
2 root 15 -5 0 0 0 S 0 0.0 3:27.03 kthreadd
3 root RT -5 0 0 0 S 0 0.0 0:01.66 migration/0
4 root 15 -5 0 0 0 S 0 0.0 0:27.74 ksoftirqd/0
5 root RT -5 0 0 0 S 0 0.0 3365:16 watchdog/0
6 root RT -5 0 0 0 S 0 0.0 0:08.92 migration/1
This high load start after starting apache2 (with modjk) so users can enter the server using the hardware balancer. And the load is increasing always to strange 
levels like 99 only stopping tomcat fix it.


Please help




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